增强纤维对环氧树脂基体电子束固化特征的影响研究

STUDY ON EFFECT OF REINFORCE FIBER ON CHARACTERISTIC OF ELECTRON BEAM CURING IN EPOXY RESIN MATRIX

通过研究增强纤维对环氧树脂的电子束辐射固化区域增长形貌及固化度梯度变化的影响发现:未经处理的碳纤维与树脂混合体系经辐射固化后,在纤维根部存在明显空隙。碳纤维经过硝酸处理后,树脂与纤维间的界面结合明显改善。加入增强纤维后,树脂体系的辐射固化层厚度和凝胶含量均有所下降,其下降幅度随纤维含量增加而变大,碳纤维的影响作用大于玻璃纤维。与纯树脂体系相比,纤维树脂混合体系在靠近电子束辐射表面处的凝胶含量随辐射深度增加现象不明显。

As an innovative curing technology conforming to the developing trend of low cost and nuisance free, the electron beam (EB) curing of composites has been receiving extensive attention in recent years. Many works about fundamental research of EB curing should be done to promote its development. The effects of reinforce fiber on electron beam curing process and curing degree of epoxy resin matrix were studied in the paper. The results of observing the cured areas indicate that the obvious interspace exists around the fiber in the cured mixture of untreated carbon fiber and epoxy resins. After the carbon fiber is treated with acid, the combination at the interface of fiber and resin matrix is improved in the radiated samples. The curing degree in the cured sample containing fiber decreases with the radiation depth, unlike the top curing degree that occurs at some depth instead of the radiated surface in the neat resin system. When the reinforce fibers are mixed with resin, the thickness of the radiation-cured area and the curing degree decrease. The effect of carbon fiber is more obvious than that of glass fiber.