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以采用溶剂交换和熔融机械搅拌相结合的方法制备了纳米纤维素-竹粉改性的环氧树脂复合材料。采用拉伸性能测试、示差扫描量热仪(DSC)研究了复合材料的力学性能及固化反应。结果表明:随着竹粉含量增加,竹粉改性环氧体系的拉伸强度及拉伸弹性模量呈上升趋势,但断裂伸长率明显降低。而竹粉与纳米纤维素协同改性的环氧体系不仅改善了断裂伸长率而且在原来基础上再次提升了拉伸强度及拉伸模量。与纯的环氧基体相比,添加纳米纤维素质量分数为0.2%及竹粉质量分数为20%的体系性能最佳。竹粉的加入对环氧树脂固化反应有一定的阻碍作用,而纳米纤维素对反应有一定的促进作用。
A nanocellulose-bamboo powder modified epoxy resin composite was prepared by a combination of solvent exchange and melt mechanical stirring. Tensile properties and DSC were used to study the mechanical properties and curing reaction of the composites. The results showed that with the increase of bamboo powder content, the tensile strength and tensile elastic modulus of bamboo powder modified epoxy system increased, but the elongation at break decreased obviously. The synergistic modification of bamboo powder and nano-cellulose epoxy system not only improves the elongation at break but also enhances the tensile strength and tensile modulus again. Compared with the pure epoxy matrix, the system with 0.2% nanocellulose mass fraction and 20% bamboo powder mass fraction had the best performance. The addition of bamboo powder has a certain hindering effect on the curing reaction of the epoxy resin, while the nano cellulose has a certain promotion effect on the reaction.