【摘要】 在环氧树脂乳液中分别加入了3,3’-二甲基-4,4’-二氨基二环己基甲烷(DMDC)和7k型水溶性胺类固化剂,以提高碳纤维上胶剂的集束性。研究了固化剂用量、种类对上胶剂稳定性、集束性及复合材料界面粘接性能的影响。采用离心沉降法评价了上胶剂的稳定性,通过傅立叶红外光谱(FT-IR)和扫描电子显微镜(SEM)分析了上胶剂的化学结构和复合材料的破坏断口。结果显示,7k型水溶性固化剂可以提高环氧树脂乳液的稳定性,明显改善碳纤维的集束性,同时提高碳纤维与环氧648基体树脂间的界面粘接性能,使复合材料的层间剪切强度(ILSS)从77 MPa提高到86.5 MPa。更多还原

【Abstract】 Two curing agents,3,3′-dimethyl-4,4′-diaminodicyclohexylmethane(DMDC) and 7k water-soluble curing agent have been added to epoxy resin emulsions so as to improve the strand integrity of carbon fibers.The influence of the different curing agents on the stability of the sizing agent,the strand integrity of the carbon fibers,and the interlaminar shear strength(ILSS) were studied.Centrifugal sedimentation was used to evaluate the stability of the sizing agent.Analysis of the chemical structure of the sizing agent was performed by Fourier transform infrared(FT-IR) spectroscopy.The failure sections of carbon fiber reinforced epoxy resin composite materials were visualized by scanning electron microscopy(SEM).The results showed that 7k curing agent could improve both the stability of epoxy resin emulsions and the strand integrity of carbon fibers,which effectively enhanced the bonding between carbon fiber and resin matrix,leading to an increase in the ILSS of the composite materials from 77 MPa to 86.5 MPa.更多还原