单宁酸表面改性PE-UHMW纤维及其界面性能研究OA北大核心CSTPCD

In this paper,tannic acid(TA)was used to modify the surface of ultra-high molecular weight polyethylene(PE-UHMW)fiber.The effects of metal ion type and reaction time on the properties of PE-UHMW fiber modified by tannic acid and metal ion(TA-[M])were studied.Polyethyleneimine(PEI)was introduced into TA-[M]modified solution.The effect of PEI molecular weight on the properties of TA-[M]-PEI modified PE-UHMW fiber and the effect of PEI on the stability of TA coating were studied.The results indicated that the TA coating was successfully coated on the sur-face of PE-UHMW fiber,and the phenolic hydroxyl functional group was introduced on the surface of the fiber.The in-terfacial shear strength between fiber and epoxy resin(EP)increased by 102.03%after TA-Fe modification for 12 h.The interfacial shear strength with polyurethane resin(PU)increased by 97.78%.The interfacial bonding strength be-tween fiber and PU increased by 44.35%after TA-Fe modification for 12 h.The interfacial bonding strength with EP increased by 58.50%.The amino compound PEI can improve the stability of TA coating.After ultrasonic cleaning ex-periment,the interfacial bonding strength of PE@TA-Fe-PEI600 decreased less than that of PE@TA-Fe.