Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7890661 | Composites Part A: Applied Science and Manufacturing | 2016 | 32 Pages |
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 â45.13Â kcal/mol to â62.22Â 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 (1Â kHz), which is about 150Â times higher than that of pure PVDF.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Qikai Guo, Qingzhong Xue, Tiantian Wu, Xinglong Pan, Jianqiang Zhang, Xiaofang Li, Lei Zhu,