On the volume resistivity of silica nanoparticle filled epoxy with different surface modifications. (August 2017)

• Record Type: Journal Article
• Authors: Chu, Pengfei; Zhang, Hui; Zhao, Jun; Gao, Feng; Guo, Yufeng; Dang, Bin; Zhang, Zhong
• Is Part Of: Composites. Volume 99(2017)
• Page Start: 139
• Page End: 148
• Publication Date: 2017-08
• Subjects: A. Nanoparticle -- A. Nanocomposites -- B. Interface -- B. Electrical properties; Composite materials -- Periodicals; Manufacturing processes -- Periodicals; Composite materials; Manufacturing processes; Periodicals; 620.11805
• DOI: 10.1016/j.compositesa.2017.03.036
• Languages: English
• ISSNs: 1359-835X

Abstract

Abstract: It was found that metallic oxide nanoparticles may positively influence insulation properties of polymers working under high electric field. Herewith, four kinds of surface-modified silica nanoparticles were employed to fabricate epoxy nanocomposites. The surface properties of nanoparticles were characterized by Fourier-transform infrared spectroscopy, thermogravimetric analysis and contact angles. The effects of surface modification, filler fraction and test temperature on volume resistivity ( ρ v ) of epoxy nanocomposites were studied. It was found that, at different test temperatures, the long-alkyl-modified nanoparticles resulted in higher ρ v values of epoxy and less ρ v sensitivity to temperature, compared to the short-alkyl-modified and hydroxyl-modified ones. The surface polarity of nanoparticles was found to correlate with the ρ v values well. The surface modification may cause two possible mechanisms that affect the ρ v values of the epoxy: (i) to offer the nanoparticles different levels of water absorption; (ii) to change the Maxwell-Wagner-Sillars polarization behaviors of the composites.