Highly thermally conductive flame-retardant epoxy nanocomposites with reduced ignitability and excellent electrical conductivities. (8th February 2017)

• Record Type: Journal Article
• Authors: Gu, Junwei; Liang, Chaobo; Zhao, Xiaomin; Gan, Bin; Qiu, Hua; Guo, Yonqiang; Yang, Xutong; Zhang, Qiuyu; Wang, De-Yi
• Is Part Of: Composites science and technology. Volume 139(2017)
• Page Start: 83
• Page End: 89
• Publication Date: 2017-02-08
• Subjects: Polymer-matrix composites (PMCs) -- Thermal properties -- Thermogravimetric analysis (TGA) -- Casting; Composite materials -- Periodicals; Composite materials; Fibrous composites; Periodicals; 620.118
• DOI: 10.1016/j.compscitech.2016.12.015
• Languages: English
• ISSNs: 0266-3538

Abstract

Abstract: A highly efficient phenylphosphonate-based flame-retardant epoxy resin (FREP) was firstly prepared from phenylphosphonic dichloride (PPDCl) and allylamine (AA). Functionalized graphite nanoplatelets ( f GNPs) fillers were then performed to fabricate the f GNPs/FREP nanocomposites via mixing followed by casting method. The thermally conductive coefficient ( λ ), thermal diffusivity ( α ), flame retardancy, electrical conductivities and thermal stabilities of the f GNPs/FREP nanocomposites were all enhanced with the increasing addition of f GNPs fillers. The λ and α value of the f GNPs/FREP nanocomposite with 30 wt% f GNPs fillers was increased to 1.487 W/mK and 0.990 mm 2 /s, about 7 times and 6 times for that of pure FREP matrix (0.234 W/mK and 0.170 mm 2 /s), respectively. And the corresponding electrical conductivity was also increased to 5.0 × 10 −4 S/cm, far better than that of pure FREP matrix (1.0 × 10 −12 S/cm). In comparison with that of pure FREP, the THR and TSP value of the f GNPs/FREP nanocomposite with 15 wt% f GNPs fillers was decreased by 37% and 32%, respectively, char yield was increased by 13%, and LOI value was increased from 31% to 37%. However, the peak of heat release rate of the f GNPs/FREP nanocomposite became worse due to its high thermal conductivity. Nanoindentation revealed that there was negligible influence of f GNPs fillers on the hardness values and Young's modulus of the f GNPs/FREP nanocomposites.