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多壁碳纳米管对C/E复合材料力学性能的影响
邓火英, 方洲, 梁馨, 毛科铸, 蒋文革
航天材料及工艺研究所,北京 100076
摘要:
采用多壁碳纳米管(MWNTs)进行环氧树脂的改性,并制备了碳纤维热熔预浸料。研究了MWNTs的改性方法、规格、含量对树脂基体的流变特性和碳纤维复合材料力学性能的影响。结果表明:MWNTs的管径越小,改性树脂的黏度升高越明显,加入相容剂可降低工艺上的成型难度。MWNTs的长径比越大增韧效果越好,长径比较小时增强效果较好。C/E复合材料的0°、90°压缩强度、层剪强度、CAI性能均随着MWNT-NH2(b)含量的提高呈现先增加后降低的趋势,当MWNT-NH2(b)的含量为2%(质量分数)时,上述性能最优,0°、90°压缩模量则呈现逐渐增加的趋势。拔出与断裂、桥联效应、裂纹偏转效应是碳纳米管在C/E复合材料中的主要作用机制。
关键词:  MWNTs  碳纤维  环氧树脂  复合材料  力学性能  作用机制
DOI:10.12044/j.issn.1007-2330.2019.01.009
分类号:
基金项目:
Effect of MWNTs on Mechanical Properties of C/E Composites
DENG Huoying, FANG Zhou, LIANG Xin, MAO Kezhu, JIANG Wenge
Aerospace Research Institute of Materials & Processing Technology,Beijing 100076
Abstract:
Epoxy resin was modified by MWNTs and hot-melt prepreg reinforced by carbon fiber was manufactured.The effects of the modification methods,specifications and contents of MWNTs on rheology characteristic of resin matrix and the mechanical properties of carbon fiber composites were investigated.The results show that the viscosity of modified resin increases more evidently when the diameter of MWNTs is smaller,the difficulties of fabricating process reduce as compatibilizer is put in.The toughening effect of high ratio of MWNTs is better than that of low ratio NWNTs.As the content of MWNT-NH2(b) increases,the 0°,90° compressive strength,interlaminar shear strength and CAI of carbon fiber/epoxy composites improve primarily and reduce subsequently.When the content of MWNT-NH2(b) is 2wt%,the above mechanical properties are optimal,and the 0°,90°compressive moduli-enhance gradually.Pull-out and fracture,bridging and crack deflexion are the main action mechanisms of carbon nanotubes in the carbon fiber/epoxy composites.
Key words:  Multi-walled carbon nanotubes  Carbon fiber  Epoxy resin  Composites  Mechanical properties  Effect mechanism