Open AccessIn situ synthesis of high dielectric constant GNPs/PBO nanocomposites with enhanced thermostability
Author(s) -
Chen Yi,
Kong Zhen,
Chen Wenqi,
Xiao Lv,
Yuan Yong,
Li Zhongquan,
Zhuang Qixin
Publication year - 2019
Publication title -
iet nanodielectrics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.23
H-Index - 9
ISSN - 2514-3255
DOI - 10.1049/iet-nde.2019.0002
Subject(s) - materials science , nanocomposite , composite material , dielectric , composite number , in situ polymerization , polymer , graphite , nanoparticle , casting , polymerization , nanotechnology , optoelectronics
Graphite nanoparticles (GNPs) were introduced into poly(p‐phenylene benzobisoxazole) (PBO) matrix to produce composites via in situ polymerisation. Films of various composites were fabricated through the solution casting method in methanesulfonic acid (MSA) with the help of two sand core plates. The interlayer spacing of GNPs increased slightly confirmed by XRD as a result of an expanding effect caused by continuously formed PBO chains between the graphene nanosheets of GNPs during polymerisation. Also, due to the uniform dispersion of GNPs into PBO matrix, composite films exhibited an improved tensile strength (258 MPa, 72% higher than that of pure PBO) with 5 wt% loading of GNPs fillers. The initial decomposition temperature of the composite is ∼630°C. Besides, benefitting from the interfacial polarisation in this conductive filler/polymer system, the dielectric constant of the composites with 10 wt% loading of GNPs reached 6.96, which were over two times higher than that of pristine PBO polymer (2.91).