摘要
本文用超临界二氧化碳流体做反应介质,利用其超强的扩散性及溶解渗透性,将甲苯-2,4-二异氰酸酯(TDI)带到芳纶纤维表面进行渗透并发生接枝、扩链反应,通过红外光谱、扫描电镜、x-射线光电子能谱方法、AFM等测试了纤维的表面形貌变化及元素、基团变化,并用VARI成型技术制成复合材料,测试了改性芳纶布与环氧基体的力学性能和界面性能。结果表明:经改性的纤维表面变得粗糙,极性基团增加,复合材料界面剪切强力明显增加,改性复合材料力学性能及界面得到改善,纤维更适合用作复合增强材料。
Modification of aramid fibers was carried out using supercritical carbon dioxide as a solvent of TDI and swelling agent for aramid fiber. The surface element and morphology of products were characterized by FT-IR, XPS, SEM, AFM. Aramid fiber and expoy matrix composites were made with VARI forming technology and their mechanical properties and interfacial properties were tested. Mechanical properties and interfacial properties results show that TDI was reacted with the fiber by Grafting and chain extension reaction on the surface, making the surface rougher and polarized groups over the surface more. The shear strength values of the aramid/epoxy composites were enhanced by treated in ScCO2 with TDI. These results indicated that aramid fiber treated in scCO2 with TDI technique, which is a suitable way of process, can significantly improve the surface properties of aramid fibers reinforced epoxy resin matrix.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2015年第2期257-262,共6页
Journal of Materials Science and Engineering
基金
国家重点基础研究发展计划资助项目(2011Cb606101)
关键词
超临界二氧化碳
芳纶纤维
表面改性
甲苯-2
4-二异氰酸酯
Superfluid carbon dioxide （ScCO2）
Aramid fiber
Surface modification
Diphenyl methane diisocyanate
