水性上浆剂对碳纤维表面及碳纤维/环氧树脂复合材料界面性能的影响

Effect of waterborne sizing agent on carbon fiber surface and properties of carbon fiber/epoxy composites interface

以4,4’-亚甲基双(异氰酸苯酯)(MDI)为扩链剂,将Triton X-100(TX-100)引入到双酚A二缩水甘油醚(DGEBA)中,设计合成水性碳纤维上浆剂(DGEBA-MDI-TX-100),并利用合成的水性上浆剂对碳纤维表面进行改性。在此基础上,以环氧树脂为基体,制备碳纤维/环氧树脂复合材料,研究了水性上浆剂改性碳纤维对碳纤维表面性能及其复合材料界面性能的影响。结果表明:与未经处理的碳纤维相比,经过上浆剂改性后的碳纤维润湿性能得到了较大的提高,与环氧树脂的接触角下降了9.1%;与环氧树脂复合后制备的复合材料的界面剪切强度提高了64.7%。

Waterborne sizing（DGEBA-MDI-TX100）of carbon fiber was designed and synthesized by using 4,4＇-diphenylmethane diisocyanate（MDI）as chain extender and grafting the Triton X-100（TX-100）on diglycidyl ether of bisphenol A（DGEBA）.The carbon fiber surface was modified by the synthesized waterborne sizing,based on which carbon/epoxy composites were prepared by using epoxy resin as the matrix.The effects of waterborne sizing agent modified on carbon fiber surface properties and the interfacial properties of carbon fiber/epoxy resin composites were investigated.The results show that compared to the unmodified carbon fiber,wetting performance of carbon fiber has been greatly improved after modified by the sizing agents,the contact angle of modified carbon fiber and epoxy resin declined by 9.1%,and the interface shear strength of modified carbon fiber/epoxy resin composite material increases by 64.7%.