Effects of filler loading and surface modification on electrical and thermal properties of epoxy/montmorillonite composite

doi:10.1088/1674-1056/27/11/117806

Abstract

Epoxy-based composites containing montmorillonite (MMT) modified by silylation reaction with γ-aminopropyltriethoxysilane (γ-APTES) and 3-(glycidyloxypropyl) trimethoxysilane (GPTMS) are successfully prepared. The effects of filler loading and surface modification on the electrical and thermal properties of the epoxy/MMT composites are investigated. Compared with the pure epoxy resin, the epoxy/MMT composite, whether MMT is surface-treated or not, shows low dielectric permittivity, low dielectric loss, and enhanced dielectric strength. The MMT in the epoxy/MMT composite also influences the thermal properties of the composite by improving the thermal conductivity and stability. Surface functionalization of MMT not only conduces to the better dispersion of the nanoparticles, but also significantly affects the electric and thermal properties of the hybrid by influencing the interfaces between MMT and epoxy resin. Improved interfaces are good for enhancing the electric and thermal properties of nanocomposites. What is more, the MMT modified with GPTMS rather than γ-APTES is found to have greater influence on improving the interface between the MMT filler and polymer matrices, thus resulting in lower dielectric loss, lower electric conductivity, higher breakdown strength, lower thermal conductivity, and higher thermal stability.

Keywords: modified epoxy resin surface modification electric property thermal property

Received: 04 July 2018
Revised: 28 August 2018
Accepted manuscript online:

PACS:	78.67.Sc	(Nanoaggregates; nanocomposites)
	81.65.-b	(Surface treatments)
	77.22.Jp	(Dielectric breakdown and space-charge effects)

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. 21806129, 51872238, 51407134, and 51521065), the China Postdoctoral Science Foundation (Grant No. 2016M590619), the Natural Science Foundation of Shandong Province, China (Grant No. ZR2016EEQ28), the State Key Laboratory of Electrical Insulation and Power Equipment, China (Grant No. EIPE14107), the Fundamental Research Funds for the Central Universities, China (Grant No. 3102018zy045), and the Natural Science Basic Research Plan in Shaanxi Province, China (Grant No. 2017JQ5116).

Corresponding Authors: Yong-Hong Cheng, Hong-Jing Wu
E-mail: cyh@mail.xjtu.edu.cn;wuhongjing@mail.nwpu.edu.cn

Cite this article:

Zi-Rui Jia(贾梓睿), Zhen-Guo Gao(高振国), Di Lan(兰笛), Yong-Hong Cheng(成永红), Guang-Lei Wu(吴广磊), Hong-Jing Wu(吴宏景) Effects of filler loading and surface modification on electrical and thermal properties of epoxy/montmorillonite composite 2018 Chin. Phys. B 27 117806

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Effects of filler loading and surface modification on electrical and thermal properties of epoxy/montmorillonite composite

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