PPy-UHMWPE纤维结构与性能的研究

针对超高分子量聚乙烯(UHMWPE)纤维与树脂界面黏结性能较差的问题，以三氯化铁为氧化剂，采用液相沉积聚合方法制备了聚吡咯-超高分子量聚乙烯（PPy-UHMWPE）复合纤维，然后将微滴直径在300-700μm的环氧树脂滴在纤维上，并对纤维/微滴试样进行拉出实验。结果表明，经吡咯沉积聚合后，PPy-UHMWPE纤维与环氧树脂的界面剪切强度有较大提高，约为未处理纤维与环氧树脂界面剪切强度的3倍。通过SEM、FTIR、DSC、DMA研究处理前后纤维表面形貌和结构的变化，表明在PPy-UHMWPE复合纤维中，PPy与UHMWPE分子链间无化学键作用，PPy-UHMWPE纤维的熔融峰为单峰，且熔点略有下降。

A study on structure and properties of PPy-UHMWPE fibers

In view of the poor interfacial bonding performance between the ultra-high molecular weight polyethylene (UHMWPE) fiber and resin, this research attempted to make polypyrrole-ultra-high molecular weight polyethylene (PPy-UHMWPE) composite fibers by liquid-phase deposition polymerization, using ferric chloride as the oxidizing agent. After that, the epoxy resin micro-droplets with a diameter of 300-700μm were put on the fiber, and the pulled out experiments were carried out on the fiber / micro-drop specimens. The experimental results showed that the interfacial shear strength between the PPy-UHMWPE fiber and epoxy resin was 2 times higher than that of untreated fiber and epoxy resin. The surface morphology and structure of the fibers before and after treatment were investigated respectively by SEM, FT-IR, DSC and DMA, and it was found there is no chemical bond between PPy and UHMWPE chain in the PPy-UHMWPE fibers. PPy-UHMWPE fibers exhibited monomorph characteristics and the melt point decreased a little.