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Kaur S, D'Souza RM, Kelly TL, Williams VE, Kaake LG. Electrostatic Correlations Lead to High Capacitance in Zwitterion-Containing Thin Films. ACS APPLIED MATERIALS & INTERFACES 2024; 16:38290-38299. [PMID: 38990772 DOI: 10.1021/acsami.4c01045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/13/2024]
Abstract
A novel zwitterion composed of an imidazolium tethered to an anionic sulfonyl(trifluoromethane sulfonyl)imide group was prepared as an alternative dielectric material to traditional ionic liquids. The zwitterion not only melted below 100 °C but also proved to be nonhygroscopic. High-capacitance organic dielectric materials were obtained by blending this compound with poly(methyl methacrylate) over a range of concentrations and thicknesses. Above a specific temperature and concentration, films exhibit a capacitance nearly equivalent to that of an electrostatic double layer, approximately 10 μF/cm2, regardless of their thickness. Grazing-incidence wide-angle X-ray scattering experiments suggest that the zwitterions adopt a lamellar ordering at their surface above a critical concentration. The observed ordering is correlated with a 1000-fold increase in capacitance. The behavior suggests that the zwitterions exhibit strong electrostatic correlations throughout the film bulk, pointing the way toward a novel class of organic dielectric materials.
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Affiliation(s)
- Simranjeet Kaur
- Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada
| | - Renita M D'Souza
- Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, Saskatchewan S7N 5C9, Canada
| | - Timothy L Kelly
- Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, Saskatchewan S7N 5C9, Canada
| | - Vance E Williams
- Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada
| | - Loren G Kaake
- Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada
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2
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Zuo P, Li J, Chen D, Nie L, Gao L, Lin J, Zhuang Q. Scalable co-cured polyimide/poly( p-phenylene benzobisoxazole) all-organic composites enabling improved energy storage density, low leakage current and long-term cycling stability. MATERIALS HORIZONS 2024; 11:271-282. [PMID: 37938919 DOI: 10.1039/d3mh01479g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2023]
Abstract
The all-organic high-temperature polymer dielectrics with promising scale-up potential have witnessed much progress in the energy storage area, etc. However, the electron suppression trap mechanisms behind many all-organic dielectrics are still unclear, especially for high temperature resistant poly(p-phenylene benzobisoxazole) (PBO) polymers. To resolve this tough issue, we herein innovatively prepared PBO-based all-organic thin films containing sulfone-based polyimide (P(DSDA-ODA)) functioning as an electron trap phase using a facile and scalable co-curing method. The great linear dielectric properties of the prepared P(DSDA-ODA)/PBO films hold high dielectric thermal stability over the temperature range from 25 °C to 200 °C. The 60 wt% P(DSDA-ODA) systems yield the lowest leakage current (3.8 × 10-8 A cm-2). The tight structure and reduced leakage current enable an enhanced breakdown strength of 60 wt% P(DSDA-ODA)/PBO (470 kV mm-1), which is 1.7 times that of pure PBO. Meanwhile, it can reach 4.16 J cm-3 of energy density, which is 257% higher than that for pure PBO thin films while concurrently maintaining a long stable charge-discharge cycle (at least 5000 times) and high charge-discharge efficiency at 85.10%. Moreover, P(DSDA-ODA)/PBO still exhibits excellent energy storage performance at high temperature compared to PBO. This innovative strategy is further verified by replacing P(DSDA-ODA) with P(6FDA-ODA), and therefore lays a solid foundation for more investigation on scalable all-organic dielectrics.
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Affiliation(s)
- Peiyuan Zuo
- The Key Laboratory of Advanced Polymer Materials of Shanghai, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.
| | - Jinpeng Li
- The Key Laboratory of Advanced Polymer Materials of Shanghai, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.
| | - Donglin Chen
- The Key Laboratory of Advanced Polymer Materials of Shanghai, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.
| | - Lingzhi Nie
- The Key Laboratory of Advanced Polymer Materials of Shanghai, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.
| | - Liang Gao
- The Key Laboratory of Advanced Polymer Materials of Shanghai, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.
| | - Jingyu Lin
- The Key Laboratory of Advanced Polymer Materials of Shanghai, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.
| | - Qixin Zhuang
- The Key Laboratory of Advanced Polymer Materials of Shanghai, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.
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3
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Karamov DD, Galiev AF, Lachinov AA, Davlyatgareev KI, Salazkin SN, Yakhin AR, Lachinov AN. Non-Conjugated Poly(Diphenylene Phthalide)-New Electroactive Material. Polymers (Basel) 2023; 15:3366. [PMID: 37631421 PMCID: PMC10459138 DOI: 10.3390/polym15163366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Revised: 08/07/2023] [Accepted: 08/09/2023] [Indexed: 08/27/2023] Open
Abstract
In organic electronics, conjugated conductive polymers are most widely used. The scope of their application is currently very wide. Non-conjugated polymers are used much less in electronics and are usually used as insulation materials or materials for capacitors. However, the potential of non-conjugated polymers is much wider, due to the fact that new electronic materials with unique electronic properties can be created on the basis of non-conjugated polymers, as well as other inorganic dielectrics. This article demonstrates the possibilities of creating electrically conductive materials with unique electronic parameters based on non-conjugated polymers. The results of the study of the sensory properties of humidity are given as examples of the practical application of the structure. The abnormal electronic properties are realized along the interface of two polymer dielectrics with functional polar groups. The submicron films of polydiphenylenephthalide were used as a dielectric. It is shown that a quasi-two-dimensional electronic structure with abnormally large values of conductivity and mobility of charge carriers occurs along the interface. These structures are often called quasi-two-dimensional electron gas (Q2DEG). This article describes the manufacturing processes of multielectrode devices. Polymer films are deposited via the spin-coating method with polymer solutions in cyclohexanone. The metal electrodes were manufactured through thermal deposition in a vacuum. Three types of metal electrodes made of aluminum, copper and chromium were used. The influence of the electron work function of contacting metals on the electronic parameters of the structure was studied. It was established that the work function decrease leads to an increase in the conductivity and mobility of charge carriers. The charge carrier parameters were estimated based on the analysis of the current-voltage characteristics within the space-charge-limited current technique. The Richardson-Schottky thermionic emission model was used to evaluate values a potential barrier at metal/organic interfaces. It was established that the change in ambient humidity strongly affects the electronic transport properties along the polymer/polymer interface. It is demonstrated that the increase in conductivity with an increase in humidity occurs due to an increase in the mobility of charge carriers and a decrease in the height of the potential barrier at the three-dimensional metal contact with two-dimensional polymer interface. The potential barrier between the electrode and the bulk of the polymer film is significantly higher than between the electrode and the quasi-two-dimensional polymer structure.
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Affiliation(s)
- Danfis D. Karamov
- Institute of Molecule and Crystal Physics—Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences, 450075 Ufa, Russia; (A.F.G.); (A.N.L.)
| | - Azat F. Galiev
- Institute of Molecule and Crystal Physics—Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences, 450075 Ufa, Russia; (A.F.G.); (A.N.L.)
| | - Alexey A. Lachinov
- Institute of Molecule and Crystal Physics—Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences, 450075 Ufa, Russia; (A.F.G.); (A.N.L.)
| | - Khalim I. Davlyatgareev
- Institute of Physics, Mathematics, Digital and Nanotechnologies, Akmulla Bashkir State Pedagogical University, 450000 Ufa, Russia
| | - Sergey N. Salazkin
- Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences, 119334 Moscow, Russia;
- Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Artur R. Yakhin
- Institute of Physics, Mathematics, Digital and Nanotechnologies, Akmulla Bashkir State Pedagogical University, 450000 Ufa, Russia
| | - Alexey N. Lachinov
- Institute of Molecule and Crystal Physics—Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences, 450075 Ufa, Russia; (A.F.G.); (A.N.L.)
- Institute of Physics, Mathematics, Digital and Nanotechnologies, Akmulla Bashkir State Pedagogical University, 450000 Ufa, Russia
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Gu D, Xie H, Liu Z, Chen S, Wang Z, Gao S. Dry tribological properties of textured PMMA composites by embedding microspheres with different thermal conductivities. RSC Adv 2023; 13:15723-15729. [PMID: 37235107 PMCID: PMC10206483 DOI: 10.1039/d3ra02286b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Accepted: 05/04/2023] [Indexed: 05/28/2023] Open
Abstract
Textured surfaces were prepared by embedding microspheres with different thermal conductivities of brass microspheres (BS), 304 stainless steel microspheres (SS), and polyoxymethylene microspheres (PS) on the surface of polymethyl methacrylate (PMMA). The effects of surface texture and filling modification on the dry tribological properties of BS/PMMA, SS/PMMA, and PS/PMMA composites were studied by ring-on-disc contact. Based on the finite element analysis of friction heat, the wear mechanisms of BS/PMMA, SS/PMMA, and PS/PMMA composites were analyzed. The results show that regular surface texture can be achieved by embedding microspheres on the PMMA surface. The friction coefficient and wear depth of the SS/PMMA composite are both the lowest. The worn surfaces of BS/PMMA, SS/PMMA, and PS/PMMA composites are divided into three micro-wear-regions. The wear mechanisms of different micro-wear-regions are different. Finite element analysis shows that thermal conductivity and thermal expansion coefficient affect the wear mechanisms of BS/PMMA, SS/PMMA, and PS/PMMA composites.
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Affiliation(s)
- Dapeng Gu
- School of Mechanical Engineering, Yanshan University Qinhuangdao 066004 China
- Aviation Key Laboratory of Science and Technology on Generic Technology of Self-lubricating Spherical Plain Bearing, Yanshan University Qinhuangdao 066004 China
| | - Hui Xie
- School of Mechanical Engineering, Yanshan University Qinhuangdao 066004 China
- Key Laboratory of Self-Lubricating Spherical Plain Bearing Technology of Hebei Province, Yanshan University Qinhuangdao, 066004 China
| | - Ziyu Liu
- School of Mechanical Engineering, Yanshan University Qinhuangdao 066004 China
| | - Suwen Chen
- School of Environmental and Chemical Engineering, Yanshan University Qinhuangdao 066004 China
| | - Zibo Wang
- School of Mechanical Engineering, Yanshan University Qinhuangdao 066004 China
- Tianjin Jingwei Hirain Technologies Co., Ltd. Tianjin 300074 China
| | - Siyuan Gao
- School of Mechanical Engineering, Yanshan University Qinhuangdao 066004 China
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5
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Zhang W, Wen G, Li H. Dewetting Behavior of Random Copolymer Films Induced by Solvent Vapor Annealing. Chemphyschem 2023; 24:e202200655. [PMID: 36414541 DOI: 10.1002/cphc.202200655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 11/19/2022] [Accepted: 11/22/2022] [Indexed: 11/24/2022]
Abstract
In recent years, the dewetting behavior of block copolymer films has been studied a lot, but that of random copolymer films was rarely studied. In this study, effects of film thickness and solvent vapor annealing duration (0 s-24 h) on the dewetting behavior of the spin-coated poly(styrene-co-acrylonitrile) (SAN) random copolymer films were mainly investigated by atomic force microscopy and contact angle method for the first time. The film thicknesses of the SAN films prepared at different concentrations were characterized by X-ray reflectometry to be 6-34 nm. With the annealing of acetone vapor, the SAN films first appear holes and then rupture into droplets which fuse and break periodically. The periodic evolutions of the droplets are due to the preferred affinity of acetone molecules with the AN segments and the change of surface energy. This phenomenon is different from the single evolutions in the spin-coated polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) block copolymer films. This illustrates the interactions between AN segments and the substrate are stronger than those between PMMA segments and the substrate in the spin-coated films.
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Affiliation(s)
- Wang Zhang
- Department of Polymer Materials and Engineering, College of Materials Science and Chemical Engineering, Harbin University of Science and Technology, 4 Linyuan Road, Harbin, 150040, PR China
| | - Gangyao Wen
- Department of Polymer Materials and Engineering, College of Materials Science and Chemical Engineering, Harbin University of Science and Technology, 4 Linyuan Road, Harbin, 150040, PR China
| | - Hongfei Li
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, PR China
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6
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Luo Q, Shen H, Zhou G, Xu X. A mini-review on the dielectric properties of cellulose and nanocellulose-based materials as electronic components. Carbohydr Polym 2023; 303:120449. [PMID: 36657840 DOI: 10.1016/j.carbpol.2022.120449] [Citation(s) in RCA: 16] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2022] [Revised: 11/27/2022] [Accepted: 12/07/2022] [Indexed: 12/14/2022]
Abstract
Cellulose-based materials have the advantages of renewable, non-toxic, flexible, and strong mechanical properties, so it of is great significance to study the dielectric properties of cellulose-based materials. In this paper, we summarized the factors influencing the dielectric properties of cellulose and nanocellulose-based dielectric and the ways to change the dielectric properties, mainly exploring the methods to improve the dielectric constant of cellulose-based dielectric materials. Cellulose and nanocellulose-based dielectric need to improve the hygroscopic property, increase the flexibility and reduce dielectric loss of the composite materials. This review summarizes the current state-of-art progress of new dielectric materials for green energy storage and flexible electronic devices.
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Affiliation(s)
- Qiguan Luo
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology and Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou 510006, PR China
| | - Huimin Shen
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology and Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou 510006, PR China
| | - Guofu Zhou
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology and Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou 510006, PR China; Shenzhen Guohua Optoelectronics Technology Co., Ltd., Shenzhen 518110, Guangdong, China; Shenzhen Guohua Optoelectronics Research Institute, Shenzhen 518110, Guangdong, China
| | - Xuezhu Xu
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology and Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou 510006, PR China.
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7
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Saeed PA, Juraij K, Saharuba PM, Sujith A. A one-pot water mediated process for developing conductive composites with segregated network of poly(3,4-ethylenedioxythiophene) on spherical poly(methyl methacrylate) particles. JOURNAL OF POLYMER RESEARCH 2023. [DOI: 10.1007/s10965-023-03497-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
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8
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Wang Q, Che J, Wu W, Hu Z, Liu X, Ren T, Chen Y, Zhang J. Contributing Factors of Dielectric Properties for Polymer Matrix Composites. Polymers (Basel) 2023; 15:polym15030590. [PMID: 36771891 PMCID: PMC9921423 DOI: 10.3390/polym15030590] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2023] [Revised: 01/21/2023] [Accepted: 01/22/2023] [Indexed: 01/27/2023] Open
Abstract
Due to the trend of multi-function, integration, and miniaturization of electronics, traditional dielectric materials are difficult to satisfy new requirements, such as balanced dielectric properties and good designability. Therefore, high dielectric polymer composites have attracted wide attention due to their outstanding processibility, good designability, and dielectric properties. A number of polymer composites are employed in capacitors and sensors. All these applications are directly affected by the composite's dielectric properties, which are highly depended on the compositions and internal structure design, including the polymer matrix, fillers, structural design, etc. In this review, the influences of matrix, fillers, and filler arrangement on dielectric properties are systematically and comprehensively summarized and the regulation strategies of dielectric loss are introduced as well. Finally, the challenges and prospects of high dielectric polymer composites are proposed.
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Affiliation(s)
- Quan Wang
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, Qingdao University of Science & Technology, Qingdao 266042, China
| | - Junbo Che
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, Qingdao University of Science & Technology, Qingdao 266042, China
| | - Weifei Wu
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, Qingdao University of Science & Technology, Qingdao 266042, China
| | - Zhendong Hu
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, Qingdao University of Science & Technology, Qingdao 266042, China
| | - Xueqing Liu
- Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education and Flexible Display Materials and Technology Co-Innovation Centre of Hubei Province, Jianghan University, Wuhan 430056, China
| | - Tianli Ren
- Mississippi Polymer Institute, The University of Southern Mississippi, Hattiesburg, MS 39406, USA
| | - Yuwei Chen
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, Qingdao University of Science & Technology, Qingdao 266042, China
- Correspondence:
| | - Jianming Zhang
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, Qingdao University of Science & Technology, Qingdao 266042, China
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9
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Rahman MM, Ahmed L, Anika F, Riya AA, Kali SK, Rauf A, Sharma R. Bioinorganic Nanoparticles for the Remediation of Environmental Pollution: Critical Appraisal and Potential Avenues. Bioinorg Chem Appl 2023; 2023:2409642. [PMID: 37077203 PMCID: PMC10110382 DOI: 10.1155/2023/2409642] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 05/21/2022] [Accepted: 03/27/2023] [Indexed: 04/21/2023] Open
Abstract
Nowadays, environmental pollution has become a critical issue for both developed and developing countries. Because of excessive industrialization, burning of fossil fuels, mining and exploration, extensive agricultural activities, and plastics, the environment is being contaminated rapidly through soil, air, and water. There are a variety of approaches for treating environmental toxins, but each has its own set of restrictions. As a result, various therapies are accessible, and approaches that are effective, long-lasting, less harmful, and have a superior outcome are extensively demanded. Modern research advances focus more on polymer-based nanoparticles, which are frequently used in drug design, drug delivery systems, environmental remediation, power storage, transformations, and other fields. Bioinorganic nanomaterials could be a better candidate to control contaminants in the environment. In this article, we focused on their synthesis, characterization, photocatalytic process, and contributions to environmental remediation against numerous ecological hazards. In this review article, we also tried to explore their recent advancements and futuristic contributions to control and prevent various pollutants in the environment.
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Affiliation(s)
- Md. Mominur Rahman
- Department of Pharmacy, Faculty of Allied Health Sciences, Daffodil International University, Dhaka 1207, Bangladesh
| | - Limon Ahmed
- Department of Pharmacy, Faculty of Allied Health Sciences, Daffodil International University, Dhaka 1207, Bangladesh
| | - Fazilatunnesa Anika
- Department of Pharmacy, Faculty of Allied Health Sciences, Daffodil International University, Dhaka 1207, Bangladesh
| | - Anha Akter Riya
- Department of Pharmacy, East-West University, Aftabnagar, Dhaka 1212, Bangladesh
| | - Sumaiya Khatun Kali
- Department of Pharmacy, Faculty of Allied Health Sciences, Daffodil International University, Dhaka 1207, Bangladesh
| | - Abdur Rauf
- Department of Chemistry, University of Swabi, Swabi, Anbar, KPK, Pakistan
| | - Rohit Sharma
- Department of Rasa Shastra and Bhaishajya Kalpana, Faculty of Ayurveda, Institute of Medical Sciences, Banaras Hindu University, Varanasi 221005, Uttar Pradesh, India
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Gutierrez Suburu ME, Maisuls I, Kösters J, Strassert CA. Room-temperature luminescence from Pd(II) and Pt(II) complexes: from mechanochromic crystals to flexible polymer matrices. Dalton Trans 2022; 51:13342-13350. [PMID: 35983882 DOI: 10.1039/d2dt01693a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of Pd(II) (PdLOMe, PdLOHex) and Pt(II) (PtLOMe, PtLOHex) complexes bearing tetradentate ligands as dianionic luminophores were synthesized. Hence, the cyclometallating chelators were alternatively decorated with two n-hexyloxy (LOHex) or two methoxy (LOMe) moieties to promote crystallization and processability. The new compounds were unambiguously characterized by means of multiple NMR spectroscopies and mass spectrometry as well as by single crystal X-ray diffractometric analysis (PtLOMe and PdLOMe). Steady state and time-resolved photoluminescence spectroscopic studies were carried out in crystalline phases, in fluid solutions at room temperature, in frozen glassy matrices at 77 K and in a flexible polymeric matrix (PMMA). PtLOMe presents an intriguing mechanochromism resulting from the responsive metal-metal interactions involving adjacent monomeric units. Incorporation of the Pd(II) complexes into the polymeric matrix boosts their photophysical properties by stiffening of the coordination environment while reducing non-radiative deactivation pathways mediated by dissociative metal-centred states, which also become thermally inaccessible at 77 K.
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Affiliation(s)
- Matias E Gutierrez Suburu
- Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstraße 28/30, D-48149 Münster, Germany. .,CeNTech, SoN, CiMIC, Westfälische Wilhelms-Universität Münster, Heisenbergstraße 11, D-48149 Munster, Germany
| | - Iván Maisuls
- Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstraße 28/30, D-48149 Münster, Germany. .,CeNTech, SoN, CiMIC, Westfälische Wilhelms-Universität Münster, Heisenbergstraße 11, D-48149 Munster, Germany
| | - Jutta Kösters
- Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstraße 28/30, D-48149 Münster, Germany.
| | - Cristian A Strassert
- Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstraße 28/30, D-48149 Münster, Germany. .,CeNTech, SoN, CiMIC, Westfälische Wilhelms-Universität Münster, Heisenbergstraße 11, D-48149 Munster, Germany
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11
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Cheng R, Wang Y, Men R, Lei Z, Song J, Li Y, Guo M. High-energy-density polymer dielectrics via compositional and structural tailoring for electrical energy storage. iScience 2022; 25:104837. [PMID: 35996580 PMCID: PMC9391588 DOI: 10.1016/j.isci.2022.104837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Dielectric capacitors with higher working voltage and power density are favorable candidates for renewable energy systems and pulsed power applications. A polymer with high breakdown strength, low dielectric loss, great scalability, and reliability is a preferred dielectric material for dielectric capacitors. However, their low dielectric constant limits the polymer to achieve satisfying energy density. Therefore, great efforts have been made to get high-energy-density polymer dielectrics. By compositional and structural tailoring, the synergic integrations of the multiple components and optimized structural design effectively improved the energy storage properties. This review presents an overview of recent advancements in the field of high-energy-density polymer dielectrics via compositional and structural tailoring. The surface/interfacial engineering conducted on both microscale and macroscale for polymer dielectrics is the focus of this review. Challenges and the promising opportunities for the development of polymer dielectrics for capacitive energy storage applications are presented at the end of this review. A detailed summary of the state-of-the-art polymer dielectrics The comparison of polymer nanocomposites with 0D, 1D, and 2D nanofillers Analyzing high Ue polymer dielectrics via compositional and structural tailoring Summary of micro- or macro-surface and interface engineering
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12
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Doganci E, Kayabasi F, Davarcı D, Demir A, Gürek AG. Synthesis of liquid crystal polymers containing cholesterol side groups and investigation of their usability potential as an insulator in organic field effect transistor (OFET) applications. JOURNAL OF POLYMER RESEARCH 2022. [DOI: 10.1007/s10965-022-02895-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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13
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Coffey B, Clough L, Bartkus DD, McClellan IC, Greenberg MW, LaFratta CN, Tanski JM, Anderson CM. Photophysical Properties of Cyclometalated Platinum(II) Diphosphine Compounds in the Solid State and in PMMA Films. ACS OMEGA 2021; 6:28316-28325. [PMID: 34723028 PMCID: PMC8552474 DOI: 10.1021/acsomega.1c04509] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Accepted: 10/04/2021] [Indexed: 05/06/2023]
Abstract
Platinum(II) compounds were synthesized with both chelate cyclometalated ligands and chelate diphosphine ligands. The cyclometalated ligands include phenylpyridine and a benzothiophene-containing ligand. The three new benzothiophene compounds were characterized by nuclear magnetic resonance (NMR) spectroscopy, high-resolution mass spectrometry (HR-MS), and photophysical measurements. In the case of one compound, L1-DPPM, the structure was determined by single crystal X-ray diffraction. The structural coherence of the noncrystalline emissive solid state was measured by X-ray total scattering real space pair distribution function analysis. Quantum yield values of all of the platinum compounds measured in the solid state and in PMMA films were much greater than in solution.
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Affiliation(s)
- Belle Coffey
- Department
of Chemistry & Biochemistry, Bard College, 30 Campus Road, Annandale-on-Hudson, New York 12504, United States
| | - Lily Clough
- Department
of Chemistry & Biochemistry, Bard College, 30 Campus Road, Annandale-on-Hudson, New York 12504, United States
| | - Daphne D. Bartkus
- Department
of Chemistry & Biochemistry, Bard College, 30 Campus Road, Annandale-on-Hudson, New York 12504, United States
| | - Ian C. McClellan
- Department
of Chemistry & Biochemistry, Bard College, 30 Campus Road, Annandale-on-Hudson, New York 12504, United States
| | - Matthew W. Greenberg
- Department
of Chemistry & Biochemistry, Bard College, 30 Campus Road, Annandale-on-Hudson, New York 12504, United States
| | - Christopher N. LaFratta
- Department
of Chemistry & Biochemistry, Bard College, 30 Campus Road, Annandale-on-Hudson, New York 12504, United States
| | - Joseph M. Tanski
- Department
of Chemistry, Vassar College, Poughkeepsie, New York 12604, United States
| | - Craig M. Anderson
- Department
of Chemistry & Biochemistry, Bard College, 30 Campus Road, Annandale-on-Hudson, New York 12504, United States
- . Tel.: 845-752-2356. Fax: 845-752-2339
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14
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Meena M, Zehra A, Swapnil P, Harish, Marwal A, Yadav G, Sonigra P. Endophytic Nanotechnology: An Approach to Study Scope and Potential Applications. Front Chem 2021; 9:613343. [PMID: 34113600 PMCID: PMC8185355 DOI: 10.3389/fchem.2021.613343] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Accepted: 01/18/2021] [Indexed: 12/11/2022] Open
Abstract
Nanotechnology has become a very advanced and popular form of technology with huge potentials. Nanotechnology has been very well explored in the fields of electronics, automobiles, construction, medicine, and cosmetics, but the exploration of nanotecnology's use in agriculture is still limited. Due to climate change, each year around 40% of crops face abiotic and biotic stress; with the global demand for food increasing, nanotechnology is seen as the best method to mitigate challenges in disease management in crops by reducing the use of chemical inputs such as herbicides, pesticides, and fungicides. The use of these toxic chemicals is potentially harmful to humans and the environment. Therefore, using NPs as fungicides/ bactericides or as nanofertilizers, due to their small size and high surface area with high reactivity, reduces the problems in plant disease management. There are several methods that have been used to synthesize NPs, such as physical and chemical methods. Specially, we need ecofriendly and nontoxic methods for the synthesis of NPs. Some biological organisms like plants, algae, yeast, bacteria, actinomycetes, and fungi have emerged as superlative candidates for the biological synthesis of NPs (also considered as green synthesis). Among these biological methods, endophytic microorganisms have been widely used to synthesize NPs with low metallic ions, which opens a new possibility on the edge of biological nanotechnology. In this review, we will have discussed the different methods of synthesis of NPs, such as top-down, bottom-up, and green synthesis (specially including endophytic microorganisms) methods, their mechanisms, different forms of NPs, such as magnesium oxide nanoparticles (MgO-NPs), copper nanoparticles (Cu-NPs), chitosan nanoparticles (CS-NPs), β-d-glucan nanoparticles (GNPs), and engineered nanoparticles (quantum dots, metalloids, nonmetals, carbon nanomaterials, dendrimers, and liposomes), and their molecular approaches in various aspects. At the molecular level, nanoparticles, such as mesoporous silica nanoparticles (MSN) and RNA-interference molecules, can also be used as molecular tools to carry genetic material during genetic engineering of plants. In plant disease management, NPs can be used as biosensors to diagnose the disease.
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Affiliation(s)
- Mukesh Meena
- Laboratory of Phytopathology and Microbial Biotechnology, Department of Botany, Mohanlal Sukhadia University, Udaipur, India
| | - Andleeb Zehra
- Centre of Advanced Study in Botany, Institute of Science, Banaras Hindu University, Varanasi, India
| | - Prashant Swapnil
- Centre of Advanced Study in Botany, Institute of Science, Banaras Hindu University, Varanasi, India
- Department of Botany, Acharya Narendra Dev College, University of Delhi, New Delhi, India
| | - Harish
- Plant Biotechnology Laboratory, Department of Botany, Mohanlal Sukhadia University, Udaipur, India
| | - Avinash Marwal
- Department of Biotechnology, Vigyan Bhawan, Mohanlal Sukhadia University, Udaipur, India
| | - Garima Yadav
- Laboratory of Phytopathology and Microbial Biotechnology, Department of Botany, Mohanlal Sukhadia University, Udaipur, India
| | - Priyankaraj Sonigra
- Laboratory of Phytopathology and Microbial Biotechnology, Department of Botany, Mohanlal Sukhadia University, Udaipur, India
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15
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Electrical conductivity of chitosan/PCL hosting network for CdSe quantum dots. Polym Bull (Berl) 2021. [DOI: 10.1007/s00289-021-03715-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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16
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Singh M, Apata IE, Samant S, Wu W, Tawade BV, Pradhan N, Raghavan D, Karim A. Nanoscale Strategies to Enhance the Energy Storage Capacity of Polymeric Dielectric Capacitors: Review of Recent Advances. POLYM REV 2021. [DOI: 10.1080/15583724.2021.1917609] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Maninderjeet Singh
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, TX
| | | | - Saumil Samant
- Department of Polymer Engineering, University of Akron, Akron, OH
| | - Wenjie Wu
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, TX
| | | | - Nihar Pradhan
- Department of Chemistry, Physics and Atmospheric Science, Jackson State University, Jackson, MS
| | | | - Alamgir Karim
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, TX
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17
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Luo J, Mao J, Sun W, Wang S, Zhang L, Tian L, Chen Y, Cheng Y. Research Progress of All Organic Polymer Dielectrics for Energy Storage from the Classification of Organic Structures. MACROMOL CHEM PHYS 2021. [DOI: 10.1002/macp.202100049] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Jiaming Luo
- State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an 710049 China
| | - Jiale Mao
- State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an 710049 China
| | - Wenjie Sun
- State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an 710049 China
| | - Shuang Wang
- State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an 710049 China
| | - Lei Zhang
- State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an 710049 China
| | - Liliang Tian
- State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an 710049 China
| | - Yu Chen
- State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an 710049 China
| | - Yonghong Cheng
- State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an 710049 China
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18
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Dielectric and optical properties of alumina and silica nanoparticles dispersed poly(methyl methacrylate) matrix-based nanocomposites for advanced polymer technologies. JOURNAL OF POLYMER RESEARCH 2021. [DOI: 10.1007/s10965-020-02406-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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19
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Yu D, Zhao J, Wang W, Qi J, Hu Y. Mono-acrylated isosorbide as a bio-based monomer for the improvement of thermal and mechanical properties of poly(methyl methacrylate). RSC Adv 2019; 9:35532-35538. [PMID: 35528083 PMCID: PMC9074741 DOI: 10.1039/c9ra07548h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Accepted: 10/15/2019] [Indexed: 11/21/2022] Open
Abstract
Despite its optical clarity and good weatherability, poly(methyl methacrylate) (PMMA) cannot meet the needs of special occasions due to its deficient thermal and mechanical properties. To overcome these shortcomings, a type of novel bio-based monomer, mono-acrylated isosorbide, was used as a comonomer for the poly(methyl methacrylate) via a solution polymerization process. The chemical structure, the thermal and mechanical properties of the copolymerized PMMA were characterized. When the molar content of the mono-acrylated isosorbide was increased from 0% to 15%, the glass transition temperature Tg of the copolymerized PMMA was increased from 151.2 °C to 172.5 °C, and the initial decomposition temperature (T5%) was increased from 323.1 °C to 396.3 °C. Moreover, the impact strength of copolymerized PMMA increased from 10.59 kJ m−2 to 17.19 kJ m−2 and the tensile strength improved from 84.02 MPa to 97.56 MPa when the mono-acrylated isosorbide was incorporated with different contents. The incorporation of rigid and thermally stable isosorbide could contribute to the improved thermal and mechanical properties of PMMA, which would find important applications in the military and aeronautical materials under harsh service environments. With bio-based monoester of acrylated isosorbide as the comonomer, copolymerized poly(methyl methacrylate) showed improved thermal stability and mechanical properties.![]()
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Affiliation(s)
- Dinghua Yu
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University Nanjing 211816 China +86-25-58139389 +86-25-58139386
| | - Juan Zhao
- College of Pharmaceutical Science, Nanjing Tech University Nanjing 211816 China
| | - Wenjuan Wang
- College of Pharmaceutical Science, Nanjing Tech University Nanjing 211816 China
| | - Jingjie Qi
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University Nanjing 211816 China +86-25-58139389 +86-25-58139386
| | - Yi Hu
- College of Pharmaceutical Science, Nanjing Tech University Nanjing 211816 China
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20
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Fabrication and Characterization of Fully Inkjet Printed Capacitors Based on Ceramic/Polymer Composite Dielectrics on Flexible Substrates. Sci Rep 2019; 9:13324. [PMID: 31527722 PMCID: PMC6746780 DOI: 10.1038/s41598-019-49639-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Accepted: 08/28/2019] [Indexed: 11/22/2022] Open
Abstract
The preparation of fully inkjet printed capacitors containing ceramic/polymer composites as the dielectric material is presented. Therefore, ceramic/polymer composite inks were developed, which allow a fast one-step fabrication of the composite thick films. Ba0.6Sr0.4TiO3 (BST) is used as the ceramic component and poly(methyl methacrylate) (PMMA) as the polymer. The use of such composites allows printing on flexible substrates. Furthermore, it results in improved values for the permittivity compared to pure polymers. Three composite inks with varying ratio of BST to PMMA were used for the fabrication of composite thick films consisting of 33, 50 and 66 vol% BST, respectively. All inks lead to homogeneous structures with precise transitions between the different layers in the capacitors. Besides the microstructures of the printed thick films, the dielectric properties were characterized by impedance spectroscopy over a frequency range of 100 Hz to 200 kHz. In addition, the influence of a larger ceramic particle size was investigated, to raise permittivity. The printed capacitors exhibited dielectric constants of 20 up to 55 at 1 kHz. Finally, the experimental results were compared to different theoretical models and their suitability for the prediction of εcomposite was assessed.
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21
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Gu D, Zhang L, Chen S, Song K, Pan D, Yang B, Liu S. Heat treatment to improve the wear resistance of PTFE/PMMA composites. RSC Adv 2019; 9:22289-22294. [PMID: 35519445 PMCID: PMC9067079 DOI: 10.1039/c9ra04362d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Accepted: 07/13/2019] [Indexed: 11/21/2022] Open
Abstract
Polytetrafluoroethylene/poly(methyl methacrylate) (PTFE/PMMA) composites were prepared by a self-curing method. The influence of heat treatment processes on the friction and wear behaviors of PTFE/PMMA composites against bearing steel balls were studied by a ball-on-disk tribometer. The thermal performance of PTFE/PMMA composites with heat treatment was analyzed by Thermogravimetric Analysis (TGA). The surface morphologies and element distribution of PTFE/PMMA composites in a PMMA matrix were detected by Field Emission Scanning Electron Microscopy (FE-SEM) and Energy Dispersive Spectroscopy (EDS). The results indicated that the wear rates of PTFE/PMMA composites with different heat treatments significantly declined compared with the unheated treatment composite. The wear rate of the PTFE/PMMA composite decreased firstly and then increased with molding temperature and time increasing, and reduced with the molding pressure increasing. The main wear mechanisms of PTFE/PMMA composites with different heat treatments were fatigue wear and abrasive wear. Wear resistance of PMMA/PTFE composite improved by heat treatment (pressures temperatures, times).![]()
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Affiliation(s)
- Dapeng Gu
- School of Mechanical Engineering, Yanshan University Qinhuangdao 066004 China.,Aviation Key Laboratory of Science and Technology on Generic Technology of Self-Lubricating Spherical Plain Bearing, Yanshan University Qinhuangdao 066004 China
| | - Longxiao Zhang
- School of Mechanical Engineering, Yanshan University Qinhuangdao 066004 China
| | - Suwen Chen
- Department of Environmental and Chemical Engineering, Yanshan University Qinhuangdao 066004 China
| | - Kefeng Song
- School of Mechanical Engineering, Yanshan University Qinhuangdao 066004 China
| | - Deng Pan
- School of Mechanical Engineering, Yanshan University Qinhuangdao 066004 China.,Aviation Key Laboratory of Science and Technology on Generic Technology of Self-Lubricating Spherical Plain Bearing, Yanshan University Qinhuangdao 066004 China
| | - Bingchao Yang
- School of Physics and Physical Engineering, Qufu Normal University Qufu 273165 China
| | - Shouyao Liu
- School of Mechanical Engineering, Yanshan University Qinhuangdao 066004 China
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22
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Al-Gunaid MQ, T.E S, H.M G, Al-Ostoot FH, Basavarajaiah S. Optimized nano-perovskite lanthanum cuprate decorated PVA based solid polymer electrolyte. POLYM-PLAST TECH MAT 2019. [DOI: 10.1080/25740881.2019.1634729] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Murad Q.A. Al-Gunaid
- Department of Polymer Science and Technology, Sri Jayachamarajendra College of Engineering, JSS Science & Technology University, Mysuru, India
- Department of Chemistry, Faculty of Education, Dhamar University, Dhamar, Yemen
| | - Somesh T.E
- Department of Polymer Science and Technology, Sri Jayachamarajendra College of Engineering, JSS Science & Technology University, Mysuru, India
- Department of Polymer Science and Technology, JSS Research Foundation, JSSTI Campus, Mysuru, India
| | - Gayitri H.M
- Department of Electronics and Communication Engineering, Sri Jayachamarajendra College of Engineering, JSS Science and Technology University, Mysore, India
| | - Fares Hezam Al-Ostoot
- Department of Chemistry, Yuvaraja’s college, University of Mysore, Mysuru, India
- Department of Polymer Science and Technology, Department of Biochemistry, Faculty of Education & Science, Albaidha, Yemen
| | - Siddaramaiah Basavarajaiah
- Department of Polymer Science and Technology, Sri Jayachamarajendra College of Engineering, JSS Science & Technology University, Mysuru, India
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23
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Preparation and Photoluminescence of Transparent Poly(methyl methacrylate)-Based Nanocomposite Films with Ultra-High-Loading Pendant ZnS Quantum Dots. Polymers (Basel) 2018; 10:polym10111217. [PMID: 30961142 PMCID: PMC6290621 DOI: 10.3390/polym10111217] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Revised: 10/25/2018] [Accepted: 10/29/2018] [Indexed: 11/17/2022] Open
Abstract
Transparent nanocomposite films containing quantum dots are popular because of their extensive applications. However, nanoparticles tend to aggregate, resulting in phase separation of the nanoparticles in the polymer matrix. Herein, we present a bulk thermo-curing copolymerization method to fabricate poly(methyl methacrylate)-based nanocomposite films with ultra-high-loading ZnS quantum dots (ZnS/PMMA), utilizing polymerizable group-capped ZnS and monomer of methyl methacrylate (MMA). We found that the nanocomposite film is highly transparent, although the transmittance decreases with the ZnS content, especially at the wavelength between 300 nm and 400 nm. The results from X-ray diffraction (XRD), transmission electron microscopy (TEM), and dynamic mechanical thermal analysis (DMTA) show that the ZnS quantum dots maintain their original crystal structure, and are uniformly dispersed in the nanocomposite films, even with a very high ZnS content (41 wt %, determined by thermogravimetric analysis). The thermogravimetric analysis shows that the nanocomposite films possess a better thermal stability than that of pure PMMA film. The photoluminescence measurements show that ZnS/PMMA nanocomposite films have good optical properties. The fluorescence intensity increases with the increment of free ZnS content to 30 wt %, and then decreases due to self-reabsorption at a higher ZnS content. The transparent ZnS/PMMA nanocomposite films have a potential application as photoluminescence material.
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Significant Reduction of the Friction and Wear of PMMA Based Composite by Filling with PTFE. Polymers (Basel) 2018; 10:polym10090966. [PMID: 30960891 PMCID: PMC6403829 DOI: 10.3390/polym10090966] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2018] [Revised: 08/28/2018] [Accepted: 08/29/2018] [Indexed: 11/17/2022] Open
Abstract
Polytetrafluoroethylene/Poly(methyl methacrylate) (PTFE/PMMA) composite was prepared by mixing PTFE into PMMA matrix which synthesized by the PMMA powder mixture and methyl methacrylate (MMA) liquid mixture. The effects of the filling mass ratio of PTFE and powder/liquid (P/L) ratio on the friction and wear properties of PTFE/PMMA composites against bearing steel were studied by a ball-on-disk tribometer. Fourier transform infrared (FTIR), field emission scanning electron microscopy (FESEM), and energy dispersive X-ray spectroscopy (EDS) were used to characterize the synthesis of PTFE/PMMA composite. The shore hardness and glass transition temperature (Tg) were obtained respectively by shore hardness tester and differential scanning calorimetry (DSC). The results show that the friction coefficient and wear rate of PMMA based composite, comparing with the unfilled PMMA, can be significantly reduced by filling with PTFE. With the increasing of PTFE filling mass ratio, the wear rate of PTFE/PMMA composite increases. The friction coefficient and wear rate of the unfilled PMMA and PTFE/PMMA composite generally decrease with the P/L ratio increasing. The main wear mechanism of the unfilled PMMA is adhesive wear. While the main wear mechanisms of PTFE/PMMA composites are fatigue wear and abrasive wear.
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25
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In-situ PMMA modified p-cresol resin-nylon 6 polymer blends and evaluation of their hydrophobic and dielectric properties. JOURNAL OF POLYMER RESEARCH 2018. [DOI: 10.1007/s10965-018-1588-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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26
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Effects of amorphous silica nanoparticles and polymer blend compositions on the structural, thermal and dielectric properties of PEO–PMMA blend based polymer nanocomposites. JOURNAL OF POLYMER RESEARCH 2018. [DOI: 10.1007/s10965-018-1510-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Xu J, Zhang Y, Zhu W, Cui Y. Synthesis of Polymeric Nanocomposite Hydrogels Containing the Pendant ZnS Nanoparticles: Approach to Higher Refractive Index Optical Polymeric Nanocomposites. Macromolecules 2018. [DOI: 10.1021/acs.macromol.7b02315] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Jinku Xu
- Shandong Provincial Key Laboratory of Fine Chemical, School of Chemistry and Pharmaceutical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
| | - Yongchun Zhang
- Shandong Provincial Key Laboratory of Fine Chemical, School of Chemistry and Pharmaceutical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
| | - Weiyue Zhu
- Shandong Provincial Key Laboratory of Fine Chemical, School of Chemistry and Pharmaceutical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
| | - Yuezhi Cui
- Shandong Provincial Key Laboratory of Fine Chemical, School of Chemistry and Pharmaceutical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
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28
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Bergamonti L, Bondioli F, Alfieri I, Alinovi S, Lorenzi A, Predieri G, Lottici PP. Weathering resistance of PMMA/SiO2/ZrO2 hybrid coatings for sandstone conservation. Polym Degrad Stab 2018. [DOI: 10.1016/j.polymdegradstab.2017.12.012] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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29
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Doganci E, Cakirlar C, Bayir S, Yilmaz F, Yasin M. Methacrylate based side chain liquid crystalline polymers with pendant cholesterol group: Preparation and investigation of electrical conductivity mechanism. J Appl Polym Sci 2017. [DOI: 10.1002/app.45207] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Erdinc Doganci
- Department of Chemistry; Gebze Technical University; Kocaeli 41400 Turkey
- Department of Chemistry and Chemical Processing Tech; Kocaeli University; Kocaeli Turkey
| | - Cigdem Cakirlar
- Department of Physics; Gebze Technical University; Kocaeli 41400 Turkey
| | - Sumeyra Bayir
- Department of Chemistry; Gebze Technical University; Kocaeli 41400 Turkey
| | - Faruk Yilmaz
- Department of Chemistry; Gebze Technical University; Kocaeli 41400 Turkey
| | - Muhammad Yasin
- Department of Electrical Engineering; National University of Sciences and Technology; Islamabad 44000 Pakistan
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30
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Functionalisation of Colloidal Transition Metal Sulphides Nanocrystals: A Fascinating and Challenging Playground for the Chemist. CRYSTALS 2017. [DOI: 10.3390/cryst7040110] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Naderi-Gohar S, Huang KMH, Wu Y, Lau WM, Nie HY. Depth profiling cross-linked poly(methyl methacrylate) films: a time-of-flight secondary ion mass spectrometry approach. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2017; 31:381-388. [PMID: 27933719 DOI: 10.1002/rcm.7801] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2016] [Revised: 11/27/2016] [Accepted: 11/28/2016] [Indexed: 06/06/2023]
Abstract
RATIONALE In order to determine the degree of cross-linking on the surface and its variations in a nanometer-scale depth of organic materials, we developed an approach based on time-of-flight secondary ion mass spectrometry (TOF-SIMS), which provides rich chemical information in the form of fragment ions. TOF-SIMS is extremely surface-sensitive and capable of depth profiling with the use of a sputter ion beam to remove controllable amounts of substance. METHODS Poly(methyl methacrylate) (PMMA) films spin-coated on a Si substrate were cross-linked using a recently developed, surface sensitive, hyperthermal hydrogen projectile bombardment technique. The ion intensity ratio between two ubiquitous hydrocarbon ions, C6 H- and C4 H- , detected in TOF-SIMS, denoted as ρ, was used to assess the degree of cross-linking of the PMMA films. The cross-linking depth of the PMMA films was revealed by depth profiling ρ into the polymer films using a C60+ sputter beam. RESULTS The control PMMA film spin-coated on a Si substrate was characterized by ρ = 32% on its surface when using a 25 keV Bi3+ primary ion beam. This parameter on the PMMA films subjected to HHIC treatment for 10, 100 and 500 s increased to 45%, 56% and 65%, respectively. The depth profiles of ρ obtained using a 10 keV C60+ ion beam resembled an exponential decay, from which the cross-linking depth was estimated to be 3, 15 and 39 nm, respectively, for the three cross-linked PMMA films. CONCLUSIONS We demonstrated that the ion intensity ratio of C6 H- to C4 H- detected in TOF-SIMS provides a unique and simple means to assess the degree of cross-linking of the surface of PMMA films cross-linked by the surface sensitive hyperthermal hydrogen projectile bombardment technique. With a C60+ sputter beam, we were able to depth profile the PMMA films and determine cross-linking depths of the cross-linked polymer films at nanometer resolutions. Copyright © 2017 John Wiley & Sons, Ltd.
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Affiliation(s)
- Soheila Naderi-Gohar
- Surface Science Western, The University of Western Ontario, 999 Collip Circle, London, Ontario, N6G 0J3, Canada
- Department of Physics and Astronomy, The University of Western Ontario, London, Ontario, N6A 3K7, Canada
- Advanced Mineral Technology Laboratory, 100 Collip Circle, London, Ontario, N6G 4X8, Canada
| | - Kevin M H Huang
- Surface Science Western, The University of Western Ontario, 999 Collip Circle, London, Ontario, N6G 0J3, Canada
- Amec Foster-Wheeler, 700 University Avenue, Toronto, Ontario, M5G 1X6, Canada
| | - Yiliang Wu
- Advanced Materials Laboratory, Xerox Research Centre of Canada, Mississauga, Ontario, L5K 2L1, Canada
- TE Connectivity, 306 Constitution Drive, Menlo Park, CA, 94025, USA
| | - Woon Ming Lau
- Chengdu Green Energy and Green Manufacturing Technology R&D Center, Chengdu, Sichuan, 610207, China
| | - Heng-Yong Nie
- Surface Science Western, The University of Western Ontario, 999 Collip Circle, London, Ontario, N6G 0J3, Canada
- Department of Physics and Astronomy, The University of Western Ontario, London, Ontario, N6A 3K7, Canada
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Synergistic effect of carbon nanotubes on the flame retardancy of poly(methyl methacrylate)/zinc oxalate nanocomposites. Macromol Res 2016. [DOI: 10.1007/s13233-016-4104-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Prateek, Thakur VK, Gupta RK. Recent Progress on Ferroelectric Polymer-Based Nanocomposites for High Energy Density Capacitors: Synthesis, Dielectric Properties, and Future Aspects. Chem Rev 2016; 116:4260-317. [PMID: 27040315 DOI: 10.1021/acs.chemrev.5b00495] [Citation(s) in RCA: 404] [Impact Index Per Article: 50.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Dielectric polymer nanocomposites are rapidly emerging as novel materials for a number of advanced engineering applications. In this Review, we present a comprehensive review of the use of ferroelectric polymers, especially PVDF and PVDF-based copolymers/blends as potential components in dielectric nanocomposite materials for high energy density capacitor applications. Various parameters like dielectric constant, dielectric loss, breakdown strength, energy density, and flexibility of the polymer nanocomposites have been thoroughly investigated. Fillers with different shapes have been found to cause significant variation in the physical and electrical properties. Generally, one-dimensional and two-dimensional nanofillers with large aspect ratios provide enhanced flexibility versus zero-dimensional fillers. Surface modification of nanomaterials as well as polymers adds flavor to the dielectric properties of the resulting nanocomposites. Nowadays, three-phase nanocomposites with either combination of fillers or polymer matrix help in further improving the dielectric properties as compared to two-phase nanocomposites. Recent research has been focused on altering the dielectric properties of different materials while also maintaining their superior flexibility. Flexible polymer nanocomposites are the best candidates for application in various fields. However, certain challenges still present, which can be solved only by extensive research in this field.
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Affiliation(s)
- Prateek
- Department of Chemical Engineering, Indian Institute of Technology Kanpur , Kanpur 208016, India
| | - Vijay Kumar Thakur
- School of Mechanical and Materials Engineering, Washington State University , Pullman, Washington 99164, United States
| | - Raju Kumar Gupta
- Department of Chemical Engineering, Indian Institute of Technology Kanpur , Kanpur 208016, India.,DST Thematic Unit of Excellence on Soft Nanofabrication and Center for Environmental Science and Engineering, Indian Institute of Technology Kanpur , Kanpur 208016, India
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35
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IHARA H, TAKAFUJI M, KUWAHARA Y. Transparent Polymer Films Functionally-Webbed with Glutamide-Based Supramolecular Gels and Their Optical Applications. KOBUNSHI RONBUNSHU 2016. [DOI: 10.1295/koron.2015-0056] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Hirotaka IHARA
- Department of Applied Chemistry and Biochemistry, Kumamoto University
- Kumamoto Institute for Photo-Electro Organics (PHOENICS)
| | - Makoto TAKAFUJI
- Department of Applied Chemistry and Biochemistry, Kumamoto University
| | - Yutaka KUWAHARA
- Department of Applied Chemistry and Biochemistry, Kumamoto University
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36
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Thermal, Mechanical and UV-Shielding Properties of Poly(Methyl Methacrylate)/Cerium Dioxide Hybrid Systems Obtained by Melt Compounding. Polymers (Basel) 2015. [DOI: 10.3390/polym7091474] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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37
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Bose S, Schmid S, Larsen T, Sylvest Keller S, Boisen A, Almdal K. Micromechanical fast quasi-static detection of α and β relaxations with nanograms of polymer. ACTA ACUST UNITED AC 2015. [DOI: 10.1002/polb.23745] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Sanjukta Bose
- Department of Micro- and Nanotechnology; Technical University of Denmark, DTU Nanotech; DK-2800 Kongens Lyngby Denmark
| | - Silvan Schmid
- Department of Micro- and Nanotechnology; Technical University of Denmark, DTU Nanotech; DK-2800 Kongens Lyngby Denmark
| | - Tom Larsen
- Department of Mechanical Engineering; Stanford University; Stanford CA 94305
| | - Stephan Sylvest Keller
- Department of Micro- and Nanotechnology; Technical University of Denmark, DTU Nanotech; DK-2800 Kongens Lyngby Denmark
| | - Anja Boisen
- Department of Micro- and Nanotechnology; Technical University of Denmark, DTU Nanotech; DK-2800 Kongens Lyngby Denmark
| | - Kristoffer Almdal
- Department of Micro- and Nanotechnology; Technical University of Denmark, DTU Nanotech; DK-2800 Kongens Lyngby Denmark
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38
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Carraro M, Gross S. Hybrid Materials Based on the Embedding of Organically Modified Transition Metal Oxoclusters or Polyoxometalates into Polymers for Functional Applications: A Review. MATERIALS (BASEL, SWITZERLAND) 2014; 7:3956-3989. [PMID: 28788659 PMCID: PMC5453212 DOI: 10.3390/ma7053956] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Revised: 04/22/2014] [Accepted: 04/25/2014] [Indexed: 11/16/2022]
Abstract
The covalent incorporation of inorganic building blocks into a polymer matrix to obtain stable and robust materials is a widely used concept in the field of organic-inorganic hybrid materials, and encompasses the use of different inorganic systems including (but not limited to) nanoparticles, mono- and polynuclear metal complexes and clusters, polyhedral oligomeric silsesquioxanes (POSS), polyoxometalates (POM), layered inorganic systems, inorganic fibers, and whiskers. In this paper, we will review the use of two particular kinds of structurally well-defined inorganic building blocks, namely transition metals oxoclusters (TMO) and polyoxometalates (POM), to obtain hybrid materials with enhanced functional (e.g., optical, dielectric, magnetic, catalytic) properties.
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Affiliation(s)
- Mauro Carraro
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via Marzolo 1, I-35131 Padova, Italy.
- ITM-CNR, UOS di Padova, via Marzolo 1, I-35131 Padova, Italy.
| | - Silvia Gross
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via Marzolo 1, I-35131 Padova, Italy.
- Istituto per l'Energetica e le Interfasi, IENI-CNR and INSTM, UdR Padova, via Marzolo 1, I-35131 Padova, Italy.
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39
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Synthesis and Characterization of Metal Sulfides Nanoparticles/Poly(methyl methacrylate) Nanocomposites. INT J POLYM SCI 2014. [DOI: 10.1155/2014/752394] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Metal sulfides nanoparticles in poly(methyl methacrylate) matrices were prepared and characterized by infrared spectroscopy, thermogravimetric analysis, powder X-ray diffraction, scanning electron microscope (SEM), and transmission electron microscope (TEM). The FTIR confirms the dispersion of the nanoparticles in PMMA matrices with the C=O and C–O–C bonds of the PMMA shifting slightly which may be attributed to the interactions between the nanoparticles and PMMA. The ZnS nanoparticles in PMMA have average crystallite sizes of 4–7 nm while the CdS has particle size of 10 nm and HgS has crystallite sizes of 8–20 nm. The increasing order of particle sizes as calculated from the XRD is ZnS/PMMA<HgS/PMMA<CdS/PMMA and ranges from 1.02 to 1.35 nm. These calculated particle sizes are smaller than the values obtained from TEM.
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40
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Yu YY, Liu CL, Chen YC, Chiu YC, Chen WC. Tunable dielectric constant of polyimide–barium titanate nanocomposite materials as the gate dielectrics for organic thin film transistor applications. RSC Adv 2014. [DOI: 10.1039/c4ra08694e] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Polyimide (PI)–BaTiO3 (BT) NPs hybrid nanocomposite dielectrics with tunable BT loadings (X) were fabricated for investigating their properties on the pentacene organic thin film transistors (OTFTs).
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Affiliation(s)
- Yang-Yen Yu
- Department of Materials Engineering
- Ming Chi University of Technology
- New Taipei City 24301, Taiwan
- Battery Research Center of Green Energy
- Ming Chi University of Technology
| | - Cheng-Liang Liu
- Department of Chemical and Materials Engineering
- National Central University
- Taoyuan, Taiwan
| | - Yung-Chih Chen
- Department of Materials Engineering
- Ming Chi University of Technology
- New Taipei City 24301, Taiwan
| | - Yu-Cheng Chiu
- Department of Chemical Engineering
- National Taiwan University
- Taipei, Taiwan
| | - Wen-Chang Chen
- Department of Chemical Engineering
- National Taiwan University
- Taipei, Taiwan
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41
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Hess CM, Riley EA, Palos-Chávez J, Reid PJ. Measuring the spatial distribution of dielectric constants in polymers through quasi-single molecule microscopy. J Phys Chem B 2013; 117:7106-12. [PMID: 23735049 PMCID: PMC4091822 DOI: 10.1021/jp4008398] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The variation in dielectric constant is measured for thin films of poly(methyl methacrylate) (PMMA) and poly(vinylidene fluoride) (PVDF) using confocal fluorescence microscopy. Spatial variation in the local dielectric constant of the polymer films on the ~250 nm length scale is measured using the solvochromatic emission from incorporated nile red (NR) at "quasi-single molecule" (10(-7) M) and true single molecule (SM) concentrations (10(-9) M). Correlation of the NR fluorescence wavelength maximum with dielectric constant is used to transform images of NR's emission maxima to spatial variation in local dielectric constant. We demonstrate that the distributions of dielectric environments measured in the quasi- and true SM approaches are equivalent; however, the enhanced signal rates present in the quasi-SM approach result in this technique being more efficient. In addition, the quasi-SM technique reports directly on the continuous spatial variation in dielectric constant, information that is difficult to obtain in true SM studies. With regards to the polymers of interest, the results presented here demonstrate that a limited distribution of dielectric environments is present in PMMA; however, a broad distribution of environments exists in PVDF consistent with this polymer existing as a distribution of structural phases.
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Affiliation(s)
- Chelsea M. Hess
- Box 351700, Dept. of Chemistry, University of Washington, Seattle, WA 98195
| | - Erin A. Riley
- Box 351700, Dept. of Chemistry, University of Washington, Seattle, WA 98195
| | - Jorge Palos-Chávez
- Box 351700, Dept. of Chemistry, University of Washington, Seattle, WA 98195
| | - Philip J. Reid
- Box 351700, Dept. of Chemistry, University of Washington, Seattle, WA 98195
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42
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Sun DM, Liu C, Ren WC, Cheng HM. A review of carbon nanotube- and graphene-based flexible thin-film transistors. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2013; 9:1188-205. [PMID: 23519953 DOI: 10.1002/smll.201203154] [Citation(s) in RCA: 116] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2012] [Revised: 01/23/2013] [Indexed: 05/08/2023]
Abstract
Carbon nanotubes (CNTs) and graphene have attracted great attention for numerous applications for future flexible electronics, owing to their supreme properties including exceptionally high electronic conductivity and mechanical strength. Here, the progress of CNT- and graphene-based flexible thin-film transistors from material preparation, device fabrication techniques to transistor performance control is reviewed. State-of-the-art fabrication techniques of thin-film transistors are divided into three categories: solid-phase, liquid-phase, and gas-phase techniques, and possible scale-up approaches to achieve realistic production of flexible nanocarbon-based transistors are discussed. In particular, the recent progress in flexible all-carbon nanomaterial transistor research is highlighted, and this all-carbon strategy opens up a perspective to realize extremely flexible, stretchable, and transparent electronics with a relatively low-cost and fast fabrication technique, compared to traditional rigid silicon, metal and metal oxide electronics.
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Affiliation(s)
- Dong-Ming Sun
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China
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43
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Fredin LA, Li Z, Lanagan MT, Ratner MA, Marks TJ. Sustainable high capacitance at high frequencies: metallic aluminum-polypropylene nanocomposites. ACS NANO 2013; 7:396-407. [PMID: 23259679 DOI: 10.1021/nn3044148] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The high-frequency dielectric response of 0-3 polypropylene nanocomposites prepared with the activated metallocene polymerization catalyst [rac-ethylenebisindenyl]zirconium dichlororide absorbed on the native Al(2)O(3) surfaces of metallic aluminum nanoparticles is characterized. The nanocomposites produced are randomly dispersed in the polyolefin matrix with no visible defects that might degrade film dielectric properties. Electrical measurements show that as the volume fraction of Al nanoparticles is increased, the effective permittivity of the nanocomposites increases, with ε(r) values reaching ~10 at relatively low frequency (1 MHz). Because of the high permittivity and conductivity contrast between the metal nanoparticles and the polypropylene matrix, Maxwell-Wagner-Sillars theory can be applied to model the loss at high frequencies and provide insight into how the nanocomposite high frequency response scales with Al volume fraction. At higher Al nanoparticle volume fractions, mixing theories predict greater densities of nanoparticle aggregates, consistent with the experimentally observed shift of the dielectric relaxation to lower frequencies. Although these nanocomposites undergo the predicted initial dielectric relaxation with increasing frequency, the metallic nanoparticle complex permittivity imbues the higher Al volume fraction materials with relatively high, sustainable permittivities, 6, at frequencies as high as 7 GHz.
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Affiliation(s)
- Lisa A Fredin
- Department of Chemistry and the Materials Research Center, Northwestern University, Evanston, Illinois 60208-3113, USA
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44
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Controlling Foam Morphology of Poly(methyl methacrylate) via Surface Chemistry and Concentration of Silica Nanoparticles and Supercritical Carbon Dioxide Process Parameters. J CHEM-NY 2013. [DOI: 10.1155/2013/864926] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Polymer nanocomposite foams have received considerable attention because of their potential use in advanced applications such as bone scaffolds, food packaging, and transportation materials due to their low density and enhanced mechanical, thermal, and electrical properties compared to traditional polymer foams. In this study, silica nanofillers were used as nucleating agents and supercritical carbon dioxide as the foaming agent. The use of nanofillers provides an interface upon which CO2nucleates and leads to remarkably low average cell sizes while improving cell density (number of cells per unit volume). In this study, the effect of concentration, the extent of surface modification of silica nanofillers with CO2-philic chemical groups, and supercritical carbon dioxide process conditions on the foam morphology of poly(methyl methacrylate), PMMA, were systematically investigated to shed light on the relative importance of material and process parameters. The silica nanoparticles were chemically modified with tridecafluoro-1,1,2,2-tetrahydrooctyl triethoxysilane leading to three different surface chemistries. The silica concentration was varied from 0.85 to 3.2% (by weight). The supercritical CO2foaming was performed at four different temperatures (40, 65, 75, and 85°C) and between 8.97 and 17.93 MPa. By altering the surface chemistry of the silica nanofiller and manipulating the process conditions, the average cell diameter was decreased from9.62±5.22to1.06±0.32 μm, whereas, the cell density was increased from7.5±0.5×108to4.8±0.3×1011cells/cm3. Our findings indicate that surface modification of silica nanoparticles with CO2-philic surfactants has the strongest effect on foam morphology.
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45
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Mineo PG, Cristaldi DA, Motta A, Gupta T, Gulino A. Covalent poly(methyl methacrylate) nanostructures on functionalized Si(100) surfaces. RSC Adv 2013. [DOI: 10.1039/c2ra22327a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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46
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Gibelli EB, Kai J, Teotonio EE, Malta OL, Felinto MC, Brito HF. Photoluminescent PMMA polymer films doped with Eu3+-β-diketonate crown ether complex. J Photochem Photobiol A Chem 2013. [DOI: 10.1016/j.jphotochem.2012.10.015] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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47
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Yakimanskii AV, Goikhman MY, Podeshvo IV, Anan’eva TD, Nekrasova TN, Smyslov RY. Luminescence of Ln3+ lanthanide complexes in polymer matrices. POLYMER SCIENCE SERIES A 2012. [DOI: 10.1134/s0965545x1209009x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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48
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Fredin LA, Li Z, Ratner MA, Lanagan MT, Marks TJ. Enhanced energy storage and suppressed dielectric loss in oxide core-shell-polyolefin nanocomposites by moderating internal surface area and increasing shell thickness. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2012; 24:5946-5953. [PMID: 22927288 DOI: 10.1002/adma.201202183] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2012] [Revised: 08/03/2012] [Indexed: 06/01/2023]
Abstract
Dielectric loss in metal oxide core/Al(2)O(3) shell polypropylene nanocomposites scales with the particle surface area. By moderating the interfacial surface area between the phases and using increasing shell thicknesses, dielectric loss is significantly reduced, and thus the energy stored within, and recoverable from, capacitors fabricated from these materials is significantly increased, to as high as 2.05 J/cm(3).
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Affiliation(s)
- Lisa A Fredin
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA
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49
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Kyriakos K, Raftopoulos KN, Pissis P, Kyritsis A, Näther F, Häußler L, Fischer D, Vyalikh A, Scheler U, Reuter U, Pospiech D. Dielectric and thermal studies of the segmental dynamics of poly(methyl methacrylate)/silica nanocomposites prepared by the sol-gel method. J Appl Polym Sci 2012. [DOI: 10.1002/app.38599] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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50
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Sharma S, Jain A, Saxena S. Synthesis, Characterization and Antimicrobial Activity of Zirconium (IV) Complexes. JOURNAL OF THE KOREAN CHEMICAL SOCIETY-DAEHAN HWAHAK HOE JEE 2012. [DOI: 10.5012/jkcs.2012.56.4.440] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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