| POLYMERS AND POLYMER MATRIX COMPOSITES |
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| Epoxidation Modified Carbon Nanotubes and Their Effects on the Properties of o-Cresol-Formaldehyde Epoxy Resin |
| HOU Guixiang, XIE Jianqiang, YAO Shaowei, HAN Qing
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| Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials, College of Materials Science and Engineering, North China University of Science and Technology, 063210 Tangshan, China |
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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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Published: 06 November 2020
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| Fund:National Natural Science Foundation of China (51403050). |
| About author:: Guixiang Hou, Ph.D. in polymer chemistry and physics, associate professor of polymer material science and engineering, North China University of Technology. The main research interests are polymer-based nanocomposites, high performance epoxy resins and preparation of bio-based epoxy resins. |
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2020, Vol. 34 
