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环氧树脂具有优异的热性能及力学性能,但本身脆性较大。为制备低成本、高性能的环氧树脂体系,使用聚醚砜(PES)和多壁碳纳米管(MWCNT)对环氧树脂进行增韧,制备了不同PES含量的PES-环氧树脂共混物,讨论了PES含量对环氧树脂力学性能的影响;采用熔融法,并配合使用机械搅拌、高剪切分散和超声分散制备了MWCNT/PES-环氧树脂复合材料,测试了其拉伸性能及断裂韧性,用SEM观察了MWCNT在树脂中的分散状态以及拉伸试样的断口形貌。结果表明:MWCNT的加入能够提高PES-环氧树脂体系的综合力学性能,且当MWCNT含量为0.7wt%时,树脂体系的综合力学性能最好;低PES含量下,小于1.0wt%的MWCNT的加入使材料力学性能超过用20.0wt%PES改性的环氧树脂;PES与MWCNT对环氧树脂具有协同增韧作用。
Epoxy resin has excellent thermal and mechanical properties, but itself more brittle. In order to prepare a low-cost, high-performance epoxy resin system, epoxy resin was toughened by polyethersulfone (PES) and multi-walled carbon nanotubes (MWCNT) to prepare PES-epoxy blends with different PES content The effects of PES content on the mechanical properties of epoxy resin were discussed. The MWCNT / PES-epoxy composites were prepared by melt method, mechanical stirring, high shear dispersion and ultrasonic dispersion. The tensile properties And fracture toughness. The dispersion state of MWCNT in resin and the fracture morphology of tensile specimen were observed by SEM. The results show that the addition of MWCNT can improve the mechanical properties of PES-epoxy resin system. When the content of MWCNT is 0.7wt%, the mechanical properties of the resin system are the best. When the content of MWCNT is less than 1.0wt% MWCNT The mechanical property of the material is better than that of epoxy resin modified with 20.0wt% PES. PES and MWCNT have synergistic toughening effect on the epoxy resin.