Excellent dielectric properties of PVDF-based composites filled with carbonized PAN/PEG copolymer fibers |
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| Affiliation: | 1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, Shandong, PR China;2. College of Science, China University of Petroleum, Qingdao 266580, Shandong, PR China;1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, Shandong, PR China;2. College of Science, China University of Petroleum, Qingdao 266580, Shandong, PR China;1. Research Center for Membrane and Film Technology, Department of Chemical Science and Engineering, Kobe University, Rokkodaicho 1-1, Nada, Kobe, 657-8501, Japan;2. R&D Center for Membrane Technology and Department of Chemical Engineering, Chung Yuan Christian University, Chung-Li, 320, Taiwan;3. MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027, PR China;1. Laboratoire Matière Molle et Chimie, ESPCI ParisTech, PSL Research University, 10 rue Vauquelin, 75005 Paris, France;2. ARKEMA, Groupement de Recherche de Lacq, BP 34, 64170 Lacq, France;1. School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin, 150080, PR China;2. Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin, 150080, PR China |
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| Abstract: | Weak interfacial bonding between carbon materials and polymer matrix impedes the formation of homogeneous composites, challenging to the enhancement of dielectric properties of such systems. In this work, we designed novel carbonized polyacrylonitrile/polyethylene glycol copolymer fibers (CPCFs) and then used them as fillers to enhance the dielectric properties of poly(vinylidene fluoride) (PVDF)-based composites. These CPCFs are rich in nitrogen (8.55%) and oxygen (3.94%) atoms on the surface of them. The results of molecular dynamic (MD) simulations indicate that the existence of these atoms significantly increase the interaction energy between CPCFs and PVDF matrix from ?45.13 kcal/mol to ?62.22 kcal/mol, which promotes the intercalation of conductive CPCFs into insulated PVDF matrix to form ultrathin microcapacitors. As a result, the largest dielectric constant of CPCFs/PVDF composites can reach 1583 (1 kHz), which is about 150 times higher than that of pure PVDF. |
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| Keywords: | A Polymer-matrix composites (PMCs) B Fiber/matrix bond B Electrical properties C Computational modeling |
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