超高相对分子质量聚乙烯纤维的表面粘结性能研究*

Study on the Surface Adhesion of UHMWPE Fiber

在萃取阶段用表面改性剂溶液对超高相对分子质量聚乙烯(UHMWPE)冻胶纤维进行表面处理,然后经过多级热拉伸制得改性纤维。对萃取液进行了紫外吸光度分析,并对改性前后纤维的表面化学结构、力学性能和表面粘结性能进行了比较。结果表明:经表面处理的纤维表面引入许多极性基团,纤维粘结强度随拉伸倍数增加而提高,纤维粘结性能得到较大改善;表面处理对纤维的力学性能影响不大。其中EVA的改性效果最为明显,3级拉伸后纤维的粘结强度提高了100%。

During extracting process, UHMWPE gel fiber were treated with the solution of two modifiers, then the resulting modified fibers were further drawn via multi-step hot drawing. The changes of modifier concentration during extracting process were analyzed, the surface chemical structure, mechanical and surface adhesion properties of the modified fibers were studied and compared with unmodified fiber. The results showed that the ester groups were introduced into the surface of UHMWPE fiber during treating process. Surface treatment had a little effect on the mechanical properties of UHMWPE fiber, while it could improve the adhesive properties of UHMWPE fiber with epoxy resin. The surface adhesive strength of UHMWPE fiber with epoxy resin increased with increasing the draw ratio. It had been shown that EVA was a more effective modifier, after its modification, the surface adhesive strength of UHMWPE fiber with epoxy resin was improved by 100%.