杂环芳纶表面ZnO纳米界面相的构筑及其界面强化作用

Effects of ZnO Nano-Interphase on the Surface Bonding Behavior of Aramid Fibers

为了改善杂环芳纶(F3)与环氧树脂黏结性差以及不耐紫外辐射的缺点,首先对纤维进行功能化预处理,然后通过溶胶-凝胶法和水热法分别在芳纶表面生长了氧化锌纳米颗粒和氧化锌纳米线界面层。采用X成、形貌、与环氧树脂的黏结性以及抗紫外性能进行了研究。结果表明:纳米颗粒状和纳米线形态的ZnO纳米界面相能够显著提高纤维与树脂基体的黏结性能,与未处理的纤维相比,单纤维复合材料的界面剪切强度分别提高了14.1%和27.0%;同时ZnO的破坏,经过168 h紫外辐射试验后,纤维强度保持率从79.1%提高到96.7%。

To improve the interfacial adhesion of aramid (F3) fibers with epoxy resin and UV irradiation resistance, the fibers were firstly pretreated, and then ZnO nanoparticles and nanowires were introduced on the surface of aramid fibers by the sol-gel and hydrothermal process. The surface chemical composition, morphology, adhesion behavior with epoxy resin and UV resistance of fibers were characterized by X-ray photoelectron spectroscopy, field emission scanning electron microscopy, micro-debonding test and UV irradiation. Results show that the ZnO nano particle and nano wire interphases can significantly improve the bonding abilities of fibers with the resin matrix, and the interfacial shear strength of single fiber composites increases by 14.1% and 27.0% compared with that of the untreated one, respectively. Moreover, the ZnO inteiphase effectively shields the damage to chemical structure of fibers surface from UV light and the strength retention of the aramid fiber increases from 79.1% to 96.7% after 168 h of UV irradiation.