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Lee DU, Kim SC, Choi DY, Jung WK, Moon MJ. Basic amino acid-mediated cationic amphiphilic surfaces for antimicrobial pH monitoring sensor with wound healing effects. Biomater Res 2023; 27:14. [PMID: 36800989 PMCID: PMC9936651 DOI: 10.1186/s40824-023-00355-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Accepted: 02/12/2023] [Indexed: 02/19/2023] Open
Abstract
BACKGROUND The wound healing process is a complex cascade of physiological events, which are vulnerable to both our body status and external factors and whose impairment could lead to chronic wounds or wound healing impediments. Conventional wound healing materials are widely used in clinical management, however, they do not usually prevent wounds from being infected by bacteria or viruses. Therefore, simultaneous wound status monitoring and prevention of microbial infection are required to promote healing in clinical wound management. METHODS Basic amino acid-modified surfaces were fabricated in a water-based process via a peptide coupling reaction. Specimens were analyzed and characterized by X-ray photoelectron spectroscopy, Kelvin probe force microscopy, atomic force microscopy, contact angle, and molecular electrostatic potential via Gaussian 09. Antimicrobial and biofilm inhibition tests were conducted on Escherichia coli and Staphylococcus epidermidis. Biocompatibility was determined through cytotoxicity tests on human epithelial keratinocytes and human dermal fibroblasts. Wound healing efficacy was confirmed by mouse wound healing and cell staining tests. Workability of the pH sensor on basic amino acid-modified surfaces was evaluated on normal human skin and Staphylococcus epidermidis suspension, and in vivo conditions. RESULTS Basic amino acids (lysine and arginine) have pH-dependent zwitterionic functional groups. The basic amino acid-modified surfaces had antifouling and antimicrobial properties similar to those of cationic antimicrobial peptides because zwitterionic functional groups have intrinsic cationic amphiphilic characteristics. Compared with untreated polyimide and modified anionic acid (leucine), basic amino acid-modified polyimide surfaces displayed excellent bactericidal, antifouling (reduction ~ 99.6%) and biofilm inhibition performance. The basic amino acid-modified polyimide surfaces also exhibited wound healing efficacy and excellent biocompatibility, confirmed by cytotoxicity and ICR mouse wound healing tests. The basic amino acid-modified surface-based pH monitoring sensor was workable (sensitivity 20 mV pH-1) under various pH and bacterial contamination conditions. CONCLUSION Here, we developed a biocompatible and pH-monitorable wound healing dressing with antimicrobial activity via basic amino acid-mediated surface modification, creating cationic amphiphilic surfaces. Basic amino acid-modified polyimide is promising for monitoring wounds, protecting them from microbial infection, and promoting their healing. Our findings are expected to contribute to wound management and could be expanded to various wearable healthcare devices for clinical, biomedical, and healthcare applications.
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Affiliation(s)
- Dong Uk Lee
- Biomedical Manufacturing Technology Center, Korea Institute of Industrial Technology, Yeongcheon, 38822, Republic of Korea
- Department of Industrial Chemistry, Pukyong National University, Busan, 48513, Republic of Korea
| | - Se-Chang Kim
- Major of Biomedical Engineering, Division of Smart Healthcare, College of Information Technology and Convergence and New-Senior Healthcare Innovation Center (BK21 Plus), Pukyong National University, Busan, 48513, Korea
- Marine Integrated Biomedical Technology Center, The National Key Research Institutes in Universities, Pukyong National University, Busan, 48513, Korea
| | - Dong Yun Choi
- Biomedical Manufacturing Technology Center, Korea Institute of Industrial Technology, Yeongcheon, 38822, Republic of Korea.
| | - Won-Kyo Jung
- Major of Biomedical Engineering, Division of Smart Healthcare, College of Information Technology and Convergence and New-Senior Healthcare Innovation Center (BK21 Plus), Pukyong National University, Busan, 48513, Korea.
- Marine Integrated Biomedical Technology Center, The National Key Research Institutes in Universities, Pukyong National University, Busan, 48513, Korea.
- Research Center for Marine Integrated Bionics Technology, Pukyong National University, Busan, 48513, Republic of Korea.
| | - Myung Jun Moon
- Department of Industrial Chemistry, Pukyong National University, Busan, 48513, Republic of Korea.
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Fan R, Yan T, Su J, Zhao H, Zha L, Zhou J, Zhu S. A water-soluble PAAs sizing agent for enhancing interfacial adhesion of carbon fiber reinforced polyphenylene sulfide composites (CF/PPS). JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2022. [DOI: 10.1080/10601325.2022.2142135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Ruyi Fan
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Shanghai Collaborative Innovation Center of High-Performance Fibers and Composites (Province-Ministry Joint), Key Laboratory of High-Performance Fibers & Products, Ministry of Education, Center for Civil Aviation Composites, Donghua University, Shanghai, P. R. China
- Key Laboratory of Shanghai City for lightweight composites, College of Materials Science and Engineering, Donghua University, Shanghai, P. R. China
| | - Tianwen Yan
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Shanghai Collaborative Innovation Center of High-Performance Fibers and Composites (Province-Ministry Joint), Key Laboratory of High-Performance Fibers & Products, Ministry of Education, Center for Civil Aviation Composites, Donghua University, Shanghai, P. R. China
- Key Laboratory of Shanghai City for lightweight composites, College of Materials Science and Engineering, Donghua University, Shanghai, P. R. China
| | - Jiayu Su
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Shanghai Collaborative Innovation Center of High-Performance Fibers and Composites (Province-Ministry Joint), Key Laboratory of High-Performance Fibers & Products, Ministry of Education, Center for Civil Aviation Composites, Donghua University, Shanghai, P. R. China
- Key Laboratory of Shanghai City for lightweight composites, College of Materials Science and Engineering, Donghua University, Shanghai, P. R. China
| | - Hui Zhao
- School of Chemical Engineering, Sichuan University, Chengdu, P. R. China
| | - Liusheng Zha
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Shanghai Collaborative Innovation Center of High-Performance Fibers and Composites (Province-Ministry Joint), Key Laboratory of High-Performance Fibers & Products, Ministry of Education, Center for Civil Aviation Composites, Donghua University, Shanghai, P. R. China
- Key Laboratory of Shanghai City for lightweight composites, College of Materials Science and Engineering, Donghua University, Shanghai, P. R. China
| | - Jianfeng Zhou
- Key Laboratory of Shanghai City for lightweight composites, College of Materials Science and Engineering, Donghua University, Shanghai, P. R. China
| | - Shu Zhu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Shanghai Collaborative Innovation Center of High-Performance Fibers and Composites (Province-Ministry Joint), Key Laboratory of High-Performance Fibers & Products, Ministry of Education, Center for Civil Aviation Composites, Donghua University, Shanghai, P. R. China
- Key Laboratory of Shanghai City for lightweight composites, College of Materials Science and Engineering, Donghua University, Shanghai, P. R. China
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3
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Chen H, Wei Y, Cao X, Yu L, Yang Q, Liu Y, Zhong L, Qiu Y. Boosting polysulfide capture and redox conversion by functional separator combined with porous hosts for advanced Li-S batteries. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116483] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Chen H, Yu L, Cao X, Yang Q, Liu Y, Wei Y, Zeng J, Zhong L, Qiu Y. The multicomponent synergistic effect of a hierarchical Li 0.485La 0.505TiO 3 solid-state electrolyte for dendrite-free lithium-metal batteries. NANOSCALE 2022; 14:7768-7777. [PMID: 35603980 DOI: 10.1039/d2nr01143c] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Development of a composite electrolyte with high ionic conductivity, excellent electrochemical stability and preeminent mechanical strength is beneficial for suppressing Li-dendrite penetration and unstable interfacial reactions in solid-state Li-metal batteries. Herein, a novel composite electrolyte material comprising perovskite Li0.485La0.505TiO3 (LLTO), poly(ethylene oxide) (PEO), and a barium titanate (BTO)-polyimide (PI) composite matrix has been successfully fabricated. Benefiting from the well-defined ion channels, the resulting BTO-PI@LLTO-PEO-FEC-LiTFSI (BP@LPFL) exhibits excellent cycling stability, low interfacial resistance, enhanced mechanical strength, and high ionic conductivity. Particularly, BP@LPFL possesses an excellent ionic conductivity of 3.0 × 10-4 S cm-1 at room temperature and achieves a wide electrochemical window of 5.2 V (vs. Li+/Li). For Li-LiFePO4 batteries, such an ingenious structure yields a discharge capacity of 124 mA h g-1 at 0.1 C after 200 cycles at room temperature and delivers a discharge capacity of 165 mA h g-1 at 0.1 C after 110 cycles at 60 °C. Additionally, the symmetric Li cell remains stable after 700 h at a current density of 0.5 mA cm-2. Furthermore, ex situ X-ray photoelectron spectroscopy and ex situ scanning electron microscopy were used to verify the interface evolution. Besides, a flexible full battery is fabricated, which exhibits impressive performance. These properties presented here provide support for BP@LPFL as a feasible candidate electrolyte for solid-state lithium batteries.
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Affiliation(s)
- Huanhui Chen
- Shenzhen Engineering Lab of Flexible Transparent Conductive Films, School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen 518055, China.
| | - Liang Yu
- Shenzhen Engineering Lab of Flexible Transparent Conductive Films, School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen 518055, China.
| | - Xing Cao
- Shenzhen Engineering Lab of Flexible Transparent Conductive Films, School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen 518055, China.
| | - Qixin Yang
- Shenzhen Engineering Lab of Flexible Transparent Conductive Films, School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen 518055, China.
| | - Ya Liu
- Shenzhen Engineering Lab of Flexible Transparent Conductive Films, School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen 518055, China.
| | - Yanru Wei
- Shenzhen Engineering Lab of Flexible Transparent Conductive Films, School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen 518055, China.
| | - Junrong Zeng
- Shenzhen Engineering Lab of Flexible Transparent Conductive Films, School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen 518055, China.
| | - Liubiao Zhong
- Shenzhen Engineering Lab of Flexible Transparent Conductive Films, School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen 518055, China.
| | - Yejun Qiu
- Shenzhen Engineering Lab of Flexible Transparent Conductive Films, School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen 518055, China.
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Lee DU, Kim DW, Lee SY, Choi DY, Choi SY, Moon KS, Shon MY, Moon MJ. Amino acid-mediated negatively charged surface improve antifouling and tribological characteristics for medical applications. Colloids Surf B Biointerfaces 2022; 211:112314. [PMID: 35033790 DOI: 10.1016/j.colsurfb.2021.112314] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Revised: 12/23/2021] [Accepted: 12/30/2021] [Indexed: 11/18/2022]
Abstract
To prevent infections associated with biomedical catheters, various antimicrobial coatings have been investigated. However, those materials do not provide consistent antibacterial effects or biocompatibility, generally, due to degradation of the coating materials, in vivo. Additionally, biomedical catheters must have low surface friction to reduce tribological damage. In this study, we developed an antifouling surface composed of biocompatible amino acids (leucine, taurine, and aspartic acid) on polyimide, via modification using a series of facile immersion steps with waterborne reactions. The naturally derived amino acid could be formed highly biostable amide bonds on the polyimide surface like peptides. The amino acid-modified surface formed a water layer with antifouling performance through the hydrophilic properties of amino acids. Amino acid-mediated modification reduced adhesion up to 84.45% and 94.81% against Escherichia coli and Staphylococcus epidermidis, respectively, and exhibited an excellent prevention to adhesion against the proteins, albumin and fibrinogen. Evaluation of the surface friction of the catheter revealed a dramatic reduction in the tribological force after amino acid modification on polyimide that of 0.81 N to aspartic acid of 0.44 N. These results clearly demonstrate a reduced occurrence of infections, thrombi and tribological damage following the relatively facile surface modification of catheters. The proposed modification method can be used in a continuous manufacturing process via using the same time of modification steps for the easy producing the product. Moreover, the method uses biocompatible naturally derived materials and can be applied to medical equipment that requires biocompatibility and biofunctionality with polyimide surfaces.
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Affiliation(s)
- Dong Uk Lee
- Department of Industrial Chemistry, Pukyong National University, Busan 48513, Republic of Korea
| | - Dong Won Kim
- Research Institute for Green Energy Convergence Technology, Gyeongsang National University, Jinju, Gyeongnam 52828, Republic of Korea
| | - Seung Yeup Lee
- Department of Applied Bioscience, Dong-A University, Busan 49315, Republic of Korea
| | - Dong Yun Choi
- Biomedical Manufacturing Technology Center, Korea Institute of Industrial Technology, Yeongcheon, Gyeongbuk 38822, Republic of Korea
| | - Seung Yong Choi
- Department of Industrial Chemistry, Pukyong National University, Busan 48513, Republic of Korea
| | - Kyoung-Seok Moon
- Department of Materials Engineering and Convergence Technology, School of materials Science and Engineering, Gyeongsang National University, Jinju, Gyeongnam 52828, Republic of Korea
| | - Min Young Shon
- Department of Industrial Chemistry, Pukyong National University, Busan 48513, Republic of Korea.
| | - Myung Jun Moon
- Department of Industrial Chemistry, Pukyong National University, Busan 48513, Republic of Korea.
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Yu Z, Li L, Wang Z. Dielectric properties of calamansi (Citrus microcarpa) under high-temperature treatment. J Food Sci 2021; 86:5375-5384. [PMID: 34796504 DOI: 10.1111/1750-3841.15973] [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: 06/17/2021] [Revised: 10/10/2021] [Accepted: 10/19/2021] [Indexed: 11/30/2022]
Abstract
High-temperature treatment of fruit is a developing way of decreasing nutrient loss and preventing decay. Its effect on calamansi (Citrus microcarpa) has not yet been reported. This study aims to study the effects of high-temperature treatment via dielectric properties. The results show that high-temperature treatment of calamansi suppresses the dielectric constant between 200 MHz and 20 GHz and alters loss factor between 200 MHz and 10 GHz. Storage at room temperature can affect loss factor between 4.5 and 10 GHz. These results may indicate that the dehydration process first affects the loss factor from 4.5 to 10 GHz, and then from 200 MHz to 4.5 GHz. This study may be favorable for evaluating calamansi's quality during storage and transportation. Moreover, the loss factor under 10 GHz is promising as an index for monitoring the water deficit and for assessing the adopted pre-treatment on calamansi. PRACTICAL APPLICATION: The quality inspector can use nondestructive examination ways to measure the dielectric property for evaluating Citrus microcarpa's quality and storage time after harvest. Moreover, the adopted pre-treatment may be speculated.
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Affiliation(s)
- Zhongliang Yu
- College of New Materials and New Energies, Shenzhen Technology University, Shenzhen, Guangdong, China
| | - Lili Li
- College of Heath Science and Environment Engineering, Shenzhen Technology University, Shenzhen, Guangdong, China
| | - Zhizhong Wang
- College of New Materials and New Energies, Shenzhen Technology University, Shenzhen, Guangdong, China
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7
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Mass-Synthesized Solution-Processable Polyimide Gate Dielectrics for Electrically Stable Operating OFETs and Integrated Circuits. Polymers (Basel) 2021; 13:polym13213715. [PMID: 34771272 PMCID: PMC8586921 DOI: 10.3390/polym13213715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Revised: 10/25/2021] [Accepted: 10/26/2021] [Indexed: 11/17/2022] Open
Abstract
Polyimides (PIs) are widely utilized polymeric materials for high-temperature plastics, adhesives, dielectrics, nonlinear optical materials, flexible hard-coating films, and substrates for flexible electronics. PIs can be facilely mass-produced through factory methods, so the industrial application value is limitless. Herein, we synthesized a typical poly(amic acid) (PAA) precursor-based solution through an industrialized reactor for mass production and applied the prepared solution to form thin films of PI using thermal imidization. The deposited PI thin films were successfully applied as gate dielectrics for organic field-effect transistors (OFETs). The PI layers showed suitable characteristics for dielectrics, such as a smooth surface, low leakage current density, uniform dielectric constant (k) values regardless of frequency, and compatibility with organic semiconductors. Utilizing this PI layer, we were able to fabricate electrically stable operated OFETs, which exhibited a threshold voltage shift lower than 1 V under bias-stress conditions and a field-effect mobility of 4.29 cm2 V-1 s-1. Moreover, integrated logic gates were manufactured using these well-operated OFETs and displayed suitable operation behavior.
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8
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Davletbaeva I, Sazonov O, Nikitina E, Kapralova V, Nizamov A, Akhmetov I, Arkhipov A, Sudar N. Dielectric properties of organophosphorus polyurethane ionomers. J Appl Polym Sci 2021. [DOI: 10.1002/app.51751] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Ilsiya Davletbaeva
- Department of Synthetic Rubber Kazan National Research Technological University Kazan Russia
| | - Oleg Sazonov
- Department of Synthetic Rubber Kazan National Research Technological University Kazan Russia
| | - Elizaveta Nikitina
- Institute of Physics, Nanotechnologies and Telecommunications Peter the Great St.Petersburg Polytechnic University St.Petersburg Russia
| | - Victoria Kapralova
- Institute of Physics, Nanotechnologies and Telecommunications Peter the Great St.Petersburg Polytechnic University St.Petersburg Russia
| | - Aidar Nizamov
- Department of Synthetic Rubber Kazan National Research Technological University Kazan Russia
| | - Ildar Akhmetov
- Department of Synthetic Rubber Kazan National Research Technological University Kazan Russia
| | - Alexander Arkhipov
- Institute of Physics, Nanotechnologies and Telecommunications Peter the Great St.Petersburg Polytechnic University St.Petersburg Russia
| | - Nicolay Sudar
- Institute of Physics, Nanotechnologies and Telecommunications Peter the Great St.Petersburg Polytechnic University St.Petersburg Russia
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9
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Polyimide-Derived Carbon-Coated Li 4Ti 5O 12 as High-Rate Anode Materials for Lithium Ion Batteries. Polymers (Basel) 2021; 13:polym13111672. [PMID: 34063791 PMCID: PMC8196661 DOI: 10.3390/polym13111672] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2021] [Revised: 05/19/2021] [Accepted: 05/19/2021] [Indexed: 11/16/2022] Open
Abstract
Carbon-coated Li4Ti5O12 (LTO) has been prepared using polyimide (PI) as a carbon source via the thermal imidization of polyamic acid (PAA) followed by a carbonization process. In this study, the PI with different structures based on pyromellitic dianhydride (PMDA), 4,4′-oxydianiline (ODA), and p-phenylenediamine (p-PDA) moieties have been synthesized. The effect of the PI structure on the electrochemical performance of the carbon-coated LTO has been investigated. The results indicate that the molecular arrangement of PI can be improved when the rigid p-PDA units are introduced into the PI backbone. The carbons derived from the p-PDA-based PI show a more regular graphite structure with fewer defects and higher conductivity. As a result, the carbon-coated LTO exhibits a better rate performance with a discharge capacity of 137.5 mAh/g at 20 C, which is almost 1.5 times larger than that of bare LTO (94.4 mAh/g).
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Lima RJS, Okhrimenko DV, Rudić S, Telling MTF, Sakai VG, Hwang D, Barin G, Eckert J, Lee JW, Bordallo HN. Ammonia Storage in Hydrogen Bond-Rich Microporous Polymers. ACS APPLIED MATERIALS & INTERFACES 2020; 12:58161-58169. [PMID: 33326228 DOI: 10.1021/acsami.0c18855] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The fascinating structural flexibility of porous polymers is highly attractive because it can result in optimized materials with specific host-guest interactions. Nevertheless, the fundamental mechanisms responsible for controlling the weak interactions of these hydrogen bond-rich networks-essential for developing smart task-specific materials used in recognition, capture, and sequestration processes-remain unexplored. Herein, by systematically comparing performance changes between poly(amic acid) (PAA)- and polycyclic imide (PI)-based porous polymers before and after NH3 adsorption, the role of hydrogen bonds in conformational lability and responsiveness toward guest molecules is highlighted. By combining thermal gravimetric analysis with neutron spectroscopy supported by DFT calculations, we demonstrate that PAA's chemical and physical stability is enhanced by the presence of stronger host-guest interactions. This observation also emphasizes the idea that efficient adsorption relies on having a high number of sites, upon which gas molecules can adsorb with greater affinity via strong hydrogen bonding interactions.
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Affiliation(s)
- Rodrigo J S Lima
- Academic Unit of Physics, Universidade Federal de Campina Grande, 58429-900 Campina Grande, Paraíba, Brazil
- The Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark
| | - Denis V Okhrimenko
- Department of Chemistry, University of Copenhagen, DK-2100 Copenhagen, Denmark
| | - Svemir Rudić
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Oxon OX11 0QX, U.K
| | - Mark T F Telling
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Oxon OX11 0QX, U.K
- Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, U.K
| | | | - Dasol Hwang
- Department of Chemistry, University of Copenhagen, DK-2100 Copenhagen, Denmark
| | - Gokhan Barin
- Department of Chemistry, University of California, Berkeley, California 94720-1460, United States
| | - Juergen Eckert
- Department of Chemistry and Biochemistry, Texas Tech, Lubbock, Texas 79409-1061, United States
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Ji-Woong Lee
- Department of Chemistry, University of Copenhagen, DK-2100 Copenhagen, Denmark
- Nano-Science Center, Department of Chemistry, University of Copenhagen, DK-2100 Copenhagen, Denmark
| | - Heloisa N Bordallo
- The Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark
- European Spallation Source ESS ERIC, P.O. Box 176, SE-221 00 Lund, Sweden
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Hwang G, Kwon YS, Lee J, Jeong YG. Enhanced mechanical and anisotropic thermal conductive properties of polyimide nanocomposite films reinforced with hexagonal boron nitride nanosheets. J Appl Polym Sci 2020. [DOI: 10.1002/app.50324] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Gyu‐Hyun Hwang
- Department of Advanced Organic Materials and Textile System Engineering Chungnam National University Daejeon South Korea
| | - Young Seung Kwon
- Department of Advanced Organic Materials and Textile System Engineering Chungnam National University Daejeon South Korea
| | - Ji‐Su Lee
- Department of Advanced Organic Materials and Textile System Engineering Chungnam National University Daejeon South Korea
| | - Young Gyu Jeong
- Department of Advanced Organic Materials and Textile System Engineering Chungnam National University Daejeon South Korea
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Zhang P, Zhang K, Chen X, Dou S, Zhao J, Li Y. Influence of Coagulation Bath Temperature on the Structure and Dielectric Properties of Porous Polyimide Films in Different Solvent Systems. ACS OMEGA 2020; 5:29889-29895. [PMID: 33251424 PMCID: PMC7689915 DOI: 10.1021/acsomega.0c04103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Accepted: 10/26/2020] [Indexed: 06/12/2023]
Abstract
In this work, the effect of coagulation bath temperature in different solvent systems [1,4-butyrolactone (GBL)/N,N-dimethylacetamide (DMAC)] on the structure and dielectric properties of polyimide (PI) films was investigated for the first time. The solubility parameter was introduced to explain the formation process of porous PI films. The results showed that the changed tendency of the dielectric constant versus temperature is opposite for the single-solvent system and cosolvent system. For a single DMAC and GBL solvent, the dielectric constants of the films decreased with increasing temperature. In contrast, the dielectric constants increased with the increase in temperature for the GBL/DMAC cosolvent system. Moreover, the measured porosities were applied to estimate the dielectric constants of the PI films. This showed that the porosity increased with increasing temperature for a single-solvent system, while it decreased for a cosolvent system. Scanning electron microscopy images suggested that the variation trends are derived from the different influences of the temperature on the structure and morphology. Thus, this study reveals the effect of coagulation bath temperature on the structure and dielectric properties of porous PI films and provides the guidance for the design and optimization of architectures for high-performance porous films.
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Affiliation(s)
- Panpan Zhang
- Taiyuan
University of Science and Technology, Jincheng Campus, Jincheng 048011, People’s Republic
of China
| | - Ke Zhang
- MIIT
Key Laboratory of Critical Materials Technology for New Energy Conversion
and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
| | - Xi Chen
- Center
for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150001, People’s
Republic of China
| | - Shuliang Dou
- Center
for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150001, People’s
Republic of China
| | - Jiupeng Zhao
- MIIT
Key Laboratory of Critical Materials Technology for New Energy Conversion
and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
| | - Yao Li
- Center
for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150001, People’s
Republic of China
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Fabrication of Nanostructured Polyamic Acid Membranes for Antimicrobially Enhanced Water Purification. ADVANCES IN POLYMER TECHNOLOGY 2020. [DOI: 10.1155/2020/7362789] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Water scarcity and quality challenges facing the world can be alleviated by Point-of-Use filtration devices (POU). The use of filtration membranes in POU devices has been limited largely because of membrane fouling, which occurs when suspended solids, microbes, and organic materials are deposited on the surface of filtration membranes significantly decreasing the membrane lifespan, thereby increasing operation costs. There is need therefore to develop filtration membranes that are devoid of these challenges. In this work, nanotechnology was used to fabricate nanostructured polyamic acid (nPAA) membranes, which can be used for microbial decontamination of water. The PAA was used as support and reducing agent to introduce silver nanoparticles (AgNPs) and gold nanoparticles (AuNPs) with antimicrobial properties. The nPAA membranes were fabricated via thermal and wet phase inversion technique and then tested against Escherichia coli and Staphylococcus aureus following standard tests. The resulting nanoparticles exhibited excellent dispersibility and stability as indicated by the color change of the solution and increments of optical density at 415 nm for AgNPs and 520 nm for AuNPs. The wet phase inversion process used produced highly porous, strong, and flexible nPAA membranes, which showed well-dispersed spherical AuNPs and AgNPs whose rough average size was found to be 35 nm and 25 nm, respectively. The AgNPs demonstrated inhibition for both gram positive E. coli and gram negative S. aureus, with a better inhibitory activity against S. aureus. A synergistic enhancement of AgNPs antimicrobial activity upon AuNPs addition was demonstrated. The nPAA membranes can thus be used to remove microbials from water and can hence be used in water purification.
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Oh W, Park JW. Facile Synthesis of Robust and Pore-Size-Tunable Nanoporous Covalent Framework Membrane by Simultaneous Gelation and Phase Separation of Covalent Network/Poly(methyl methacrylate) Mixture. ACS APPLIED MATERIALS & INTERFACES 2019; 11:32398-32407. [PMID: 31393696 DOI: 10.1021/acsami.9b10175] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We report a facile route toward the preparation of organic-solvent-resistant and three-dimensionally continuous nanoporous covalent framework membrane. The membrane was prepared from the blend of linear poly(methyl methacrylate) and the cross-linked polyurea-based organic network, followed by selective removal of the linear polymer part. The pore morphologies, porosity, and solvent permeation properties of the membrane could be simply modified by the initial composition of the poly(methyl methacrylate) added to a sol of the organic network. The pore was three-dimensionally continuous with pore size ranging from 5 nm to tens of nanometers. Despite the broad pore size distribution, ultrafiltration of sub-10 nm solutes was realized with a molecular size cutoff near 5 nm thanks to the bicontinuous pore structure of the membrane. The nanoporous structure exhibited long-term resistance to organic solvents as well as thermal stability and mechanical strength. The separation performance remained unchanged in organic-rich medium for a prolonged time. Our strategy provides a synthetic route to a structurally robust, three-dimensionally continuous nanoporous polymeric membrane for potential application that necessitates the use of organic solvent.
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Affiliation(s)
- Wangsuk Oh
- School of Materials Science and Engineering , Gwangju Institute of Science and Technology , 123 Cheomdan-gwagiro , Bukgu , Gwangju 61005 , Korea
| | - Ji-Woong Park
- School of Materials Science and Engineering , Gwangju Institute of Science and Technology , 123 Cheomdan-gwagiro , Bukgu , Gwangju 61005 , Korea
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15
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Wasada A, Haruki M, Kihara SI, Takishima S. Filling the Microscopic-scale Spaces with Polyamic Acid and Polyimide of the PMDA-ODA and PMDA-TFDB Pairs Using Supercritical Carbon Dioxide at Low Deposition Temperature. JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 2019. [DOI: 10.1252/jcej.17we393] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Atsuhiko Wasada
- Department of Chemical Engineering, Graduate School of Engineering, Hiroshima University
| | - Masashi Haruki
- Faculty of Mechanical Engineering, Institute of Science and Engineering, Kanazawa University
| | - Shin-ichi Kihara
- Department of Chemical Engineering, Graduate School of Engineering, Hiroshima University
| | - Shigeki Takishima
- Department of Chemical Engineering, Graduate School of Engineering, Hiroshima University
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16
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Mehrban N, Bowen J, Tait A, Darbyshire A, Virasami AK, Lowdell MW, Birchall MA. Silsesquioxane polymer as a potential scaffold for laryngeal reconstruction. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2018; 92:565-574. [PMID: 30184783 PMCID: PMC6134134 DOI: 10.1016/j.msec.2018.07.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Revised: 06/13/2018] [Accepted: 07/01/2018] [Indexed: 02/01/2023]
Abstract
Cancer, disease and trauma to the larynx and their treatment can lead to permanent loss of structures critical to voice, breathing and swallowing. Engineered partial or total laryngeal replacements would need to match the ambitious specifications of replicating functionality, outer biocompatibility, and permissiveness for an inner mucosal lining. Here we present porous polyhedral oligomeric silsesquioxane-poly(carbonate urea) urethane (POSS-PCUU) as a potential scaffold for engineering laryngeal tissue. Specifically, we employ a precipitation and porogen leaching technique for manufacturing the polymer. The polymer is chemically consistent across all sample types and produces a foam-like scaffold with two distinct topographies and an internal structure composed of nano- and micro-pores. While the highly porous internal structure of the scaffold contributes to the complex tensile behaviour of the polymer, the surface of the scaffold remains largely non-porous. The low number of pores minimise access for cells, although primary fibroblasts and epithelial cells do attach and proliferate on the polymer surface. Our data show that with a change in manufacturing protocol to produce porous polymer surfaces, POSS-PCUU may be a potential candidate for overcoming some of the limitations associated with laryngeal reconstruction and regeneration.
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Affiliation(s)
- Nazia Mehrban
- Division of Surgery, University College London, London, WC1E 6BT, United Kingdom.
| | - James Bowen
- School of Engineering and Innovation, The Open University, Milton Keynes, MK7 6AA, United Kingdom
| | - Angela Tait
- Department of Biochemical Engineering, University College London, London, WC1E 6BT, United Kingdom
| | - Arnold Darbyshire
- Division of Surgery, University College London, London, WC1E 6BT, United Kingdom
| | - Alex K Virasami
- Department of Histopathology, University College London, London, WC1N 3JH, United Kingdom
| | - Mark W Lowdell
- Department of Haematology, University College London, London, NW3 2QG, United Kingdom
| | - Martin A Birchall
- UCL Ear Institute, University College London, London, WC1X 8DA, United Kingdom
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17
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Ma Y, Xu L, Wu Z, Zhang W, Zhang M, He Z. Honeycomb-Patterned Polyimide Film as a Versatile Coating for High-Performance Dielectric Material. Chem Asian J 2018; 13:1836-1841. [PMID: 29947469 DOI: 10.1002/asia.201800589] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Revised: 05/11/2018] [Indexed: 11/06/2022]
Abstract
A honeycomb-patterned porous film was conveniently prepared by means of the microemulsion method and then used as an effective coating for improving the dielectric properties and water resistance of polyimide (PI) film while maintaining its mechanical properties. The dielectric properties could be regulated by tuning the structure of the porous film through controlling its formation conditions. When suitable conditions were used, the prepared composite PI film exhibited a significant reduction of 28.3 % in its dielectric constant and 9.48-54.99 % in dielectric loss accompanied by an extremely low water uptake of 0.62 % relative to the 2.47 % of flat PI film. The composite PI film also displayed excellent durability under moist conditions, as the dielectric constant was still below 2.4 after exposure to 75 % relative humidity for more than 12 h. This provides a novel method to improve and control the dielectric properties of materials. It also suggests that this film is a suitable candidate for coating dielectric materials in high-humidity environments.
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Affiliation(s)
- Yingyi Ma
- School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin, 150040, China
| | - Le Xu
- School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin, 150040, China
| | - Zijian Wu
- School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin, 150040, China
| | - Wenlong Zhang
- School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin, 150040, China
| | - Mingyan Zhang
- School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin, 150040, China
| | - Zhenfeng He
- National Demonstration Center for Experimental Chemical Engineering Comprehensive Education, School of Chemical Engineering and Technology, North University of China, Taiyuan, 030051, China
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18
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Feiz S, Navarchian AH, Jazani OM. Poly(vinyl alcohol) membranes in wound-dressing application: microstructure, physical properties, and drug release behavior. IRANIAN POLYMER JOURNAL 2018. [DOI: 10.1007/s13726-018-0600-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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19
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Hofmann A, Thißen E, Migeot M, Bohn N, Dietrich S, Hanemann T. Micron-Sized Pored Membranes Based on Polyvinylidene Difluoride Hexafluoropropylene Prepared by Phase Inversion Techniques. Polymers (Basel) 2017; 9:polym9100489. [PMID: 30965792 PMCID: PMC6418560 DOI: 10.3390/polym9100489] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Revised: 09/15/2017] [Accepted: 09/27/2017] [Indexed: 11/17/2022] Open
Abstract
In this study, micron-sized pored membranes, based on the co-polymer polyvinylidene difluoride hexafluoropropylene (PVdF-HFP) were prepared via phase inversion techniques. The aim of the approach was to find less harmful and less toxic solvents to fabricate such films. Therefore, the Hansen solubility approach was used to identify safer and less toxic organic solvents for the phase inversion process, relative to present solvent mixtures, based on acetone, dimethyl formamide, dimethyl acetamide or methanol. With this approach, it was possible to identify cyclopentanone, ethylene glycol and benzyl alcohol as suitable solvents for the membrane preparation process. Physicochemical and mechanical properties were analyzed and compared, which revealed a uniform membrane structure through the cross section. Differences were observed at the top surface, in dependence of both preparation approaches, which are described in detail.
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Affiliation(s)
- Andreas Hofmann
- Werkstoffkunde (IAM-WK), Institut für Angewandte Materialien, Karlsruher Institut für Technologie (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
| | - Eva Thißen
- Werkstoffkunde (IAM-WK), Institut für Angewandte Materialien, Karlsruher Institut für Technologie (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
| | - Matthias Migeot
- Werkstoffkunde (IAM-WK), Institut für Angewandte Materialien, Karlsruher Institut für Technologie (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
| | - Nicole Bohn
- Keramische Werkstoffe und Technologien (IAM-KWT), Institut für Angewandte Materialien, Karlsruher Institut für Technologie (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
| | - Stefan Dietrich
- Werkstoffkunde (IAM-WK), Institut für Angewandte Materialien, Karlsruher Institut für Technologie (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
| | - Thomas Hanemann
- Werkstoffkunde (IAM-WK), Institut für Angewandte Materialien, Karlsruher Institut für Technologie (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
- Institut für Mikrosystemtechnik, Universität Freiburg, Georges-Köhler-Allee 102, 79110 Freiburg, Germany.
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20
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Lee JW, Barin G, Peterson GW, Xu J, Colwell KA, Long JR. A Microporous Amic Acid Polymer for Enhanced Ammonia Capture. ACS APPLIED MATERIALS & INTERFACES 2017; 9:33504-33510. [PMID: 28388032 DOI: 10.1021/acsami.7b02603] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Amic acids, consisting of carboxylic acids and amides, are often utilized as intermediates that can further undergo a dehydration-cyclization step to yield polymeric cyclic imides. Compared with imide-based materials, the presence of Brønsted acidic groups and multiple hydrogen-bond donors and acceptors in materials incorporating amic acids opens up the possibility for a variety of host-guest interactions. Here we report a facile and catalyst-free synthesis of a Brønsted acidic porous poly(amic acid) (PAA) and present its NH3 uptake properties using gas adsorption and breakthrough measurements. Simple addition of water as a cosolvent to a mixture of tetrakis(4-aminophenyl)methane and pyromellitic anhydride resulted in the formation of PAA in almost quantitative yield. Further mechanistic studies with model compounds revealed the importance of additive water to generate amic acid species selectively without forming cyclic imides at high temperatures. Gas adsorption isotherms and breakthrough curves obtained under dry and humid conditions demonstrate the enhanced NH3 uptake in the case of PAA compared with the related polycyclic imide at both low and high pressures. Furthermore, the results of adsorption/desorption cycling experiments provide insights into the strength of the interaction between ammonia and the polymers.
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Affiliation(s)
- Ji-Woong Lee
- Department of Chemistry, University of California , Berkeley, California 94720, United States
- Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
- Department of Chemistry, University of Copenhagen , 2100 Copenhagen, Denmark
| | - Gokhan Barin
- Department of Chemistry, University of California , Berkeley, California 94720, United States
- Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
| | - Gregory W Peterson
- Edgewood Chemical Biological Center, U.S. Army Research, Development, and Engineering Command , 5183 Blackhawk Road, Aberdeen Proving Ground, Maryland 21010, United States
| | - Jun Xu
- Department of Chemical and Biological Engineering, University of California , Berkeley, California 94720, United States
| | - Kristen A Colwell
- Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
- Department of Chemical and Biological Engineering, University of California , Berkeley, California 94720, United States
| | - Jeffrey R Long
- Department of Chemistry, University of California , Berkeley, California 94720, United States
- Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
- Department of Chemical and Biological Engineering, University of California , Berkeley, California 94720, United States
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21
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Chen Z, Huang H, Yan S, Zheng Z, Liu S, Yuan Y, Zhao J, Fu Y. New Synthetic Approach of Fluorine-Containing Graphene Oxide for Improving Dielectric and Mechanical Properties of Polyimide Composites. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.7b02183] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zhigeng Chen
- School
of Materials Science and Engineering, South China University of Technology, Guangzhou, Guangdong 510640, China
| | - Haohao Huang
- School
of Materials Science and Engineering, South China University of Technology, Guangzhou, Guangdong 510640, China
| | - Shijing Yan
- School
of Materials Science and Engineering, South China University of Technology, Guangzhou, Guangdong 510640, China
| | - Zhanping Zheng
- School
of Materials Science and Engineering, South China University of Technology, Guangzhou, Guangdong 510640, China
| | - Shumei Liu
- School
of Materials Science and Engineering, South China University of Technology, Guangzhou, Guangdong 510640, China
| | - Yanchao Yuan
- School
of Materials Science and Engineering, South China University of Technology, Guangzhou, Guangdong 510640, China
| | - Jianqing Zhao
- School
of Materials Science and Engineering, South China University of Technology, Guangzhou, Guangdong 510640, China
| | - Yi Fu
- Silverage Engineering
Plastics (Dongguan) Co., Ltd, Dongguan 523187, China
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22
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Guo Y, Han Y, Liu F, Zhou H, Chen F, Zhao T. Fluorinated bismaleimide resin with good processability, high toughness, and outstanding dielectric properties. J Appl Polym Sci 2015. [DOI: 10.1002/app.42791] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Ying Guo
- Institute of Chemistry, Chinese Academy of Sciences; Beijing 100190 People's Republic of China
- University of Chinese Academy of Sciences; Beijing 100049 People's Republic of China
| | - Yue Han
- Institute of Chemistry, Chinese Academy of Sciences; Beijing 100190 People's Republic of China
- University of Chinese Academy of Sciences; Beijing 100049 People's Republic of China
| | - Feng Liu
- College of Chemistry and Molecular Engineering, Zhengzhou University; Zhengzhou 450001 People's Republic of China
| | - Heng Zhou
- Institute of Chemistry, Chinese Academy of Sciences; Beijing 100190 People's Republic of China
| | - Fenghua Chen
- Institute of Chemistry, Chinese Academy of Sciences; Beijing 100190 People's Republic of China
| | - Tong Zhao
- Institute of Chemistry, Chinese Academy of Sciences; Beijing 100190 People's Republic of China
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23
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Li Z, Zou H, Liu P. Morphology and properties of porous polyimide films prepared through thermally induced phase separation. RSC Adv 2015. [DOI: 10.1039/c5ra01514f] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Porous polyimide (PI) synthesized from 4,4′-oxydiphthalic anhydride (ODPA) and 4,4′-diaminodiphenyl ether (ODA) monomers is a promising material with an ultralow-dielectric constant.
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Affiliation(s)
- Zhonglun Li
- State Key Laboratory of Polymer Materials Engineering
- Polymer Research Institute of Sichuan University
- Chengdu 610065
- China
| | - Huawei Zou
- State Key Laboratory of Polymer Materials Engineering
- Polymer Research Institute of Sichuan University
- Chengdu 610065
- China
| | - Pengbo Liu
- State Key Laboratory of Polymer Materials Engineering
- Polymer Research Institute of Sichuan University
- Chengdu 610065
- China
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24
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Kwon J, Kim J, Park D, Han H. A novel synthesis method for an open-cell microsponge polyimide for heat insulation. POLYMER 2015. [DOI: 10.1016/j.polymer.2014.06.090] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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25
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Ahmed TA, Ibrahim HM, Samy AM, Kaseem A, Nutan MTH, Hussain MD. Biodegradable injectable in situ implants and microparticles for sustained release of montelukast: in vitro release, pharmacokinetics, and stability. AAPS PharmSciTech 2014; 15:772-80. [PMID: 24648158 DOI: 10.1208/s12249-014-0101-3] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2013] [Accepted: 02/23/2014] [Indexed: 11/30/2022] Open
Abstract
The objective of this study was to investigate the sustained release of a hydrophilic drug, montelukast (MK), from two biodegradable polymeric drug delivery systems, in situ implant (ISI) and in situ microparticles (ISM). N-Methyl pyrrolidone (NMP), dimethyl sulfoxide (DMSO), triacetin, and ethyl acetate were selected as solvents. The release of 10% (w/v) MK from both systems containing poly-lactic-co-glycolic acid (PLGA) as the biodegradable polymer was compared. Upon contact with the aqueous medium, the PLGA in ISI and ISM systems solidified resulting in implants and microparticles, respectively. The in vitro drug release from the ISI system showed marked difference from miscible solvents (NMP and DMSO) than the partially miscible ones (triacetin and ethyl acetate), and the drug release decreased with increased PLGA concentration. In the ISM system, the initial in vitro drug release decreased with decreased ratio of polymer phase to external oil phase. In vivo studies in rats showed that ISM had slower drug release than the drug release from ISI. Also, the ISM system when compared to ISI system had significantly reduced initial burst effect. In vitro as well as the in vivo studies for both ISI and ISM systems showed sustained release of MK. The ISM system is suitable for sustained release of MK over 4-week period with a lower initial burst compared to the ISI system. Stability studies of the ISI and ISM formulations showed that MK is stable in the formulations stored at 4°C for more than 2 years.
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