TY - JOUR
T1 - Excellent dielectric properties of PVDF-based composites filled with carbonized PAN/PEG copolymer fibers
AU - Guo, Qikai
AU - Xue, Qingzhong
AU - Wu, Tiantian
AU - Pan, Xinglong
AU - Zhang, Jianqiang
AU - Li, Xiaofang
AU - Zhu, Lei
PY - 2016
Y1 - 2016
N2 - 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. © 2016 Elsevier Ltd. All rights reserved.
AB - 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. © 2016 Elsevier Ltd. All rights reserved.
KW - Polymer-matrix composites (PMCs)
KW - Fiber/matrix bond
KW - Electrical properties
KW - Computational modeling
U2 - 10.1016/j.compositesa.2016.04.008
DO - 10.1016/j.compositesa.2016.04.008
M3 - Journal article
SN - 1359-835X
VL - 87
SP - 46
EP - 53
JO - Composites Part A: Applied Science and Manufacturing
JF - Composites Part A: Applied Science and Manufacturing
ER -