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Yang B, Wan X. Trace sorbitol-modified nano-silica: Towards nano-nucleation for poly(L-lactic acid). Int J Biol Macromol 2024; 274:133236. [PMID: 38897511 DOI: 10.1016/j.ijbiomac.2024.133236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2024] [Revised: 05/26/2024] [Accepted: 06/15/2024] [Indexed: 06/21/2024]
Abstract
Nucleating agents, especially those with small particle sizes, are preferred to boost the nucleation density and crystallinity of poly(lactic acid) (PLA) due to its weak crystallization capability. Organophilicly modified nanofillers hardly alter the nucleation and crystallinity of non-isothermally crystallized PLA. Herein, nano-silica adsorbed trace D-sorbitol (m-SiO2) as a heterogeneous nucleating agent was melt-mixed with poly(L-lactic acid) (PLLA), and the isothermal and non-isothermal crystallization behavior, as well as crystallization kinetics, were investigated. Transmission electron microscopy (TEM) revealed that m-SiO2 was uniformly dispersed in the PLA matrix as 100-300 nm clusters. Differential scanning calorimetry (DSC) and polarized optical microscopy (POM) showed that the nucleation rate and density of the non-isothermally crystallized PLLA/m-SiO2 composites were significantly improved. Despite the fact that m-SiO2 does not raise the overall non-isothermal crystallization rate, the crystallization temperature and crystallinity of the PLLA/3%m-SiO2 composite increased from 97.2 °C and 6.8 % for neat PLLA to 108.2 °C and 48.6 % (10 °C/min cooling rate), respectively. The Avrami exponent n of isothermal crystallization remains unchanged, while the crystallization rate increases dramatically. Both isothermal and non-isothermal crystallization have increased activation energies. The heat deflection temperature increased from 59 °C of neat PLLA to 152 °C with a 50 % increase in impact strength.
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Affiliation(s)
- Biao Yang
- Department of Materials Science and Engineering, Beijing Technology and Business University, Beijing 100048, China.
| | - Xinyu Wan
- Department of Materials Science and Engineering, Beijing Technology and Business University, Beijing 100048, China
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Guo Q, Wang C, Shang J, Yang Y, Xie C, Luo Y, Rong M, Pei Y, Gao Y, Zheng Z. A Freestanding, Dissolution- and Diffusion-Limiting, Flexible Sulfur Electrode Enables High Specific Capacity at High Mass Loading. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2400041. [PMID: 38469733 DOI: 10.1002/adma.202400041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Revised: 02/26/2024] [Indexed: 03/13/2024]
Abstract
The acquisition of stable and high-areal-capacity S cathodes over 10 mA h cm-2 is a critical and indispensable step to realize the high energy density configuration. However, increasing the areal capacity of S cathodes often deteriorates the specific capacity and stability due to the aggravated dissolution of S and diffusion of solvable polysulfides in the thick electrode. Herein, the design of a freestanding composite cathode that leverages 3D covalent binding sites and chemical adsorption environment to offer dissolution-limiting and diffusion-blocking functions of S species is reported. By employing this architecture, the coin cell exhibits excellent cycling stability and an exceptional specific capacity of 1444.3 mA h g-1 (13 mA h cm-2), and the pouch cell configuration manifests a noteworthy areal capacity exceeding 11 mA h cm-2. This performance is coupled with excellent flexibility, demonstrated through consecutive bending cycle tests, even at a sulfur loading of 9.00 mg cm-2. This study lays the foundation for the development of flexible Li-S batteries with increased loading capacities and exceptional performance.
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Affiliation(s)
- Qianyi Guo
- School of Fashion and Textiles, The Hong Kong Polytechnic University, Hong Kong SAR, 999077, China
| | - Chao Wang
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong SAR, 999077, China
| | - Jian Shang
- School of Fashion and Textiles, The Hong Kong Polytechnic University, Hong Kong SAR, 999077, China
| | - Yu Yang
- School of Fashion and Textiles, The Hong Kong Polytechnic University, Hong Kong SAR, 999077, China
| | - Chuan Xie
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong SAR, 999077, China
| | - Yufeng Luo
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong SAR, 999077, China
| | - Mingming Rong
- School of Fashion and Textiles, The Hong Kong Polytechnic University, Hong Kong SAR, 999077, China
| | - Yi Pei
- School of Fashion and Textiles, The Hong Kong Polytechnic University, Hong Kong SAR, 999077, China
| | - Yuan Gao
- School of Fashion and Textiles, The Hong Kong Polytechnic University, Hong Kong SAR, 999077, China
| | - Zijian Zheng
- School of Fashion and Textiles, The Hong Kong Polytechnic University, Hong Kong SAR, 999077, China
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong SAR, 999077, China
- State Key Laboratory for Ultra-Precision Machining Technology, Research Institute for Smart Energy, Research Institute for Intelligent Wearable Systems, The Hong Kong Polytechnic University, Hong Kong SAR, 999077, China
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Zhu Y, Haghniaz R, Hartel MC, Mou L, Tian X, Garrido PR, Wu Z, Hao T, Guan S, Ahadian S, Kim HJ, Jucaud V, Dokmeci MR, Khademhosseini A. Recent Advances in Bioinspired Hydrogels: Materials, Devices, and Biosignal Computing. ACS Biomater Sci Eng 2023; 9:2048-2069. [PMID: 34784170 PMCID: PMC10823919 DOI: 10.1021/acsbiomaterials.1c00741] [Citation(s) in RCA: 20] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The remarkable ability of biological systems to sense and adapt to complex environmental conditions has inspired new materials and novel designs for next-generation wearable devices. Hydrogels are being intensively investigated for their versatile functions in wearable devices due to their superior softness, biocompatibility, and rapid stimulus response. This review focuses on recent strategies for developing bioinspired hydrogel wearable devices that can accommodate mechanical strain and integrate seamlessly with biological systems. We will provide an overview of different types of bioinspired hydrogels tailored for wearable devices. Next, we will discuss the recent progress of bioinspired hydrogel wearable devices such as electronic skin and smart contact lenses. Also, we will comprehensively summarize biosignal readout methods for hydrogel wearable devices as well as advances in powering and wireless data transmission technologies. Finally, current challenges facing these wearable devices are discussed, and future directions are proposed.
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Affiliation(s)
- Yangzhi Zhu
- Terasaki Institute for Biomedical Innovation, Los Angeles, California 90064, United States
| | - Reihaneh Haghniaz
- Terasaki Institute for Biomedical Innovation, Los Angeles, California 90064, United States
| | - Martin C Hartel
- Terasaki Institute for Biomedical Innovation, Los Angeles, California 90064, United States
- Department of Bioengineering, University of California-Los Angeles, Los Angeles, California 90095, United States
| | - Lei Mou
- Terasaki Institute for Biomedical Innovation, Los Angeles, California 90064, United States
| | - Xinyu Tian
- Department of Nanoengineering, University of California, San Diego, La Jolla, California 92093, United States
| | - Pamela Rosario Garrido
- Terasaki Institute for Biomedical Innovation, Los Angeles, California 90064, United States
- Department of Electric and Electronic Engineering, Technological Institute of Merida, Merida, Yucatan 97118, Mexico
| | - Zhuohong Wu
- Department of Nanoengineering, University of California, San Diego, La Jolla, California 92093, United States
| | - Taige Hao
- Department of Nanoengineering, University of California, San Diego, La Jolla, California 92093, United States
| | - Shenghan Guan
- Terasaki Institute for Biomedical Innovation, Los Angeles, California 90064, United States
- Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089, United States
| | - Samad Ahadian
- Terasaki Institute for Biomedical Innovation, Los Angeles, California 90064, United States
| | - Han-Jun Kim
- Terasaki Institute for Biomedical Innovation, Los Angeles, California 90064, United States
| | - Vadim Jucaud
- Terasaki Institute for Biomedical Innovation, Los Angeles, California 90064, United States
| | - Mehmet R Dokmeci
- Terasaki Institute for Biomedical Innovation, Los Angeles, California 90064, United States
| | - Ali Khademhosseini
- Terasaki Institute for Biomedical Innovation, Los Angeles, California 90064, United States
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Mechanically robust and flame-retardant poly(lactide)/poly(butylene adipate-co-terephthalate) composites based on carbon nanotubes and ammonium polyphosphate. Int J Biol Macromol 2022; 221:573-584. [PMID: 36087754 DOI: 10.1016/j.ijbiomac.2022.09.033] [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: 06/14/2022] [Revised: 09/03/2022] [Accepted: 09/05/2022] [Indexed: 11/21/2022]
Abstract
In order to synchronously improve mechanical and flame retardant properties of polylactide/poly(butylene adipate-co-terephthalate) (PLA/PBAT) composites, a series of multifunctional composites containing multi-walled carbon nanotubes (CNTs), ammonium polyphosphate (APP) and a commercial multifunctional epoxy oligomer (MEO) as chain extender were prepared via melt blending. The results show that the optimal flame retardant properties of PLA5-PBAT5/10A/6C composite containing 6 % CNTs and 10 wt% APP, presented the limited oxygen index reached 28.3 % and exhibited a decrease in peak heat release rate (pHRR) and total heat release (THR) to 368 kJ/m2 and 72 MJ/m2, respectively because of the co-continuous phase, CNTs network and condensed effect of APP. Meanwhile, the construction of co-continuous phases endows PLA5-PBAT5 with better mechanical compared to PLA8-PBAT2 composites. The elongation at break reaches (245.9 %) and notched impact strength (16.5 kJ/m2) of PLA5-PBAT5/10A/6C were higher than the PLA8-PBAT2/10A/6C by 16.0 and 283.7 %.
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Eskandari P, Abousalman-Rezvani Z, Roghani-Mamaqani H, Salami-Kalajahi M. Polymer-functionalization of carbon nanotube by in situ conventional and controlled radical polymerizations. Adv Colloid Interface Sci 2021; 294:102471. [PMID: 34214841 DOI: 10.1016/j.cis.2021.102471] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Revised: 06/20/2021] [Accepted: 06/21/2021] [Indexed: 02/07/2023]
Abstract
Functionalization of carbon nanotube (CNT) with polymers has drawn much attention due to its wide range of applications. Polymer-functionalized CNT could exhibit variety of properties, such as responsivity to environmental stimuli, ability of complexation with metal ions, increased dispersibility in different solvents, higher compatibility with polymer matrix, etc. Chemical and physical methods have been developed for the preparation of polymer-functionalized CNT. Polymer chains are chemically bonded to the CNT edge or surface in the chemical methods, which results in highly stable CNT/polymer composites. "Grafting to", "grafting from", and "grafting through" methods are the most common chemical methods for polymer-functionalization of CNT. In "grafting to" method, pre-fabricated polymer chains are coupled with the either functionalized or non-functionalized CNT. In "grafting from" and "grafting through" methods, CNT is functionalized by polymers simultaneously synthesized by in situ polymerization methods. Conventional free radical polymerization (FRP) and also controlled radical polymerization (CRP) are the most promising methods for in situ tethering of polymer brushes onto the surface of CNT due to their control over the grafting density, thickness, and functionality of the polymer brushes. The main focus of this review is on the synthesis of polymer-functionalized CNT via both the "grafting from" and "grafting through" methods on the basis of FRP and CRP routs, which is commonly known as in situ polymerizations. Finally, the most important challenges and applications of the in situ polymer grafting methods are discussed, which could be interesting for the future works.
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Wang B, Liu J, Chen K, Wang Y, Shao Z. Three‐Dimensional Printing of Methacrylic Grafted Cellulose Nanocrystal‐Reinforced Nanocomposites With Improved Properties. POLYM ENG SCI 2020. [DOI: 10.1002/pen.25336] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Bo Wang
- Beijing Engineering Research Centre of Cellulose and Its DerivativesSchool of Materials Science and Engineering, Beijing Institute of Technology 100081 Beijing People's Republic of China
| | - Jianxin Liu
- Beijing Engineering Research Centre of Cellulose and Its DerivativesSchool of Materials Science and Engineering, Beijing Institute of Technology 100081 Beijing People's Republic of China
| | - Ken Chen
- Beijing Engineering Research Centre of Cellulose and Its DerivativesSchool of Materials Science and Engineering, Beijing Institute of Technology 100081 Beijing People's Republic of China
| | - Yongzhi Wang
- Beijing Engineering Research Centre of Cellulose and Its DerivativesSchool of Materials Science and Engineering, Beijing Institute of Technology 100081 Beijing People's Republic of China
| | - Ziqiang Shao
- Beijing Engineering Research Centre of Cellulose and Its DerivativesSchool of Materials Science and Engineering, Beijing Institute of Technology 100081 Beijing People's Republic of China
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Wang B, Ding G, Chen K, Jia S, Wei J, Wang Y, He R, Shao Z. A physical and chemical double enhancement strategy for 3D printing of cellulose reinforced nanocomposite. J Appl Polym Sci 2020. [DOI: 10.1002/app.49164] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Bo Wang
- Beijing Engineering Research Centre of Cellulose and Its Derivatives, School of Materials Science and EngineeringBeijing Institute of Technology Beijing China
| | - Guojiao Ding
- Institute of Advanced Structure TechnologyBeijing Institute of Technology Beijing China
| | - Ken Chen
- Beijing Engineering Research Centre of Cellulose and Its Derivatives, School of Materials Science and EngineeringBeijing Institute of Technology Beijing China
| | - Shuai Jia
- Beijing Engineering Research Centre of Cellulose and Its Derivatives, School of Materials Science and EngineeringBeijing Institute of Technology Beijing China
| | - Jie Wei
- Beijing Engineering Research Centre of Cellulose and Its Derivatives, School of Materials Science and EngineeringBeijing Institute of Technology Beijing China
| | - Yongzhi Wang
- Institute of Advanced Structure TechnologyBeijing Institute of Technology Beijing China
| | - Rujie He
- Institute of Advanced Structure TechnologyBeijing Institute of Technology Beijing China
| | - Ziqiang Shao
- Beijing Engineering Research Centre of Cellulose and Its Derivatives, School of Materials Science and EngineeringBeijing Institute of Technology Beijing China
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Liu XT, Bao RY, Li YM, Yang W, Xie BH, Yang MB. Effect of chain entanglement on the melt-crystallization behavior of poly(l-lactide) acid. JOURNAL OF POLYMER RESEARCH 2016. [DOI: 10.1007/s10965-016-1060-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Sangeetha VH, Valapa RB, Nayak SK, Varghese TO. Super toughened renewable poly(lactic acid) based ternary blends system: effect of degree of hydrolysis of ethylene vinyl acetate on impact and thermal properties. RSC Adv 2016. [DOI: 10.1039/c6ra13366e] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Effect of hydrolysed EVA on PLA ternary blend systems.
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Affiliation(s)
- V. H. Sangeetha
- Centre for Biopolymer Science and Technology (CBPST)
- Kochi
- India
| | | | - S. K. Nayak
- Central Institute of Plastics Engineering and Technology (CIPET)
- Chennai-600032
- India
| | - T. O. Varghese
- Centre for Biopolymer Science and Technology (CBPST)
- Kochi
- India
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