高强聚乙烯纤维增强复合材料界面的研究——多官能团化合物在界面中的化学键合作用

本文介绍了用重铬酸钾氧化后的聚乙烯纤维表面上的羧基为反应点 ,引入多官能团的胺类醇类化合物。用FTIR光谱、官能团定量分析法证明了氧化反应和多官能团化合物在纤维表面的存在。用纤维段在异丙醇水溶液中的沉降百分数证明了纤维表面润湿性的显著改变。同时用这一实验证明了纤维表面极性的不均匀性。这种表面不均匀性可能是单纤复合材料法测定界面粘合强度结果分散性较大的原因之一。用微脱法测定了纤维与环氧树脂的界面粘合性 ,结果证明在纤维表面引入多胺化合物 (胺类环氧固化剂 ) ,可与环氧树脂形成化学键合点 ,从而大大提高界面粘合强度。

In this work,the high strength polyethylene fiber was firstly oxidized by K 2Cr 2O 7 solution and the alcohol and amine compounds were introduced onto the surface of fiber The surface functional groups were examined by FTIR and the quality analysis The interfacial shear strength between fiber and epoxy resin measured by microbound test.The results shown that the interfacial shear strength be tween fiber and epoxy resin measured by microbound test. The results shown that the interfacial shear strength between fiber and epoxy resin was greatly improved,which may be resulted from the chemical bond formed between modified fiber and epoxy resin