Epoxidation Modified Carbon Nanotubes and Their Effects on the Properties of o-Cresol-Formaldehyde Epoxy Resin
HOU Guixiang, XIE Jianqiang, YAO Shaowei, HAN Qing
Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials, College of Materials Science and Engineering, North China University of Science and Technology, 063210 Tangshan, China
Abstract: In order to improve the dispersion of carbon nanotubes (CNTs) in epoxy resin matrix, the acidified carbon nanotubes (a-MWCNTs) was epoxidized modification with silane coupling agent (KH560) and bisphenol A epoxy resin(E44), respectively. Then, the glass fiber reinforced composites were prepared by hot pressing with o-cresol epoxy resin (o-CFER). The structure and performance of MWCNTs/o-CFER la-mination nanocomposites were studied. The results showed that epoxy functional groups were successfully introduced into the surface of a-MWCNTs after reacting with KH560 and E44 respectively. Compared with a-MWCNTs without epoxidation, the thermal stability and glass transition temperature (Tg) of o-CFER laminated composites were improved by adding epoxidation modified carbon nanotubes, the crosslinking degree of the system was increased, and the mechanical properties showed a trend of first increase and then decrease. When the content of KH560-MWCNTs and E44-MWCNTs is 1%(Mass fraction, same below), the Tg of the composites increases by 6.5 ℃ and 9 ℃, respectively. The impact strength of KH560-MWCNTs modified system is the best, which improved 129.1% compared with glass fiber reinforced pure o-CFER when the content of KH560-MWCNTs is 1%. The tensile strength of E44-MWCNTs modified system is the best, and when the content of E44-MWCNTs is 1%, the tensile strength of the composite is increased by 29.9% compared with that of glass fiber reinforced pure o-CFER. SEM results show that the epoxy functionalized MWCNTs improve their dispersion in the o-CFER matrix,the interaction between matrix and reinforced fiber is enhanced.
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2020, Vol. 34 
