Preparation And Properties Research Of Carbon Fiber Reinforced Epoxy Resin Prepreg And Composites

Carbon fiber reinforced epoxy resin prepreg is intermediate product of carbon fiber reinforced epoxy resin composite, whose performance has a direct impact on the performance of composite. Therefore, in the prepreg production process, the research of matrix resin formulation and prepreg processing technology is very important.Based on solid and liquid epoxy resin system for resin matrix composite, liquid epoxy resin E-51, solid epoxy resin CYD-011 and curing agent 4,4'-Diaminodiphenylsulfone (DDS) were chosen as the matrix resin component, and the carbon fiber reinforced epoxy resin pre prepreg preparation and properties of its composite were researched. According to the hot melt film preparing prepreg's requirements, when each component mass ratio was:epoxy resin E-51:epoxy resin CYD-011:DDS= 50:50:22.58 and could be obtained the resin film with certain strength and toughness, and could be bent without breaking. The results showed that resin quality content of prepreg being 40% was preferred, and when curing process was: curing temperature-time being 140℃/2h+160℃/2h+180℃/2h, pressure being 0.4～0.6MPa, pressure point being 140℃/1h, carbon fiber reinforced epoxy resin composite mechanical properties were optimal, and flexural strength was 1478MPa and interlaminar shear strength was 82MPa. In this paper, the experimental data for characterizing and the curing kinetics for E-51/CYD-011 epoxy resins were determined using a DSC isothermal scan method and isothermal curing kinetics parameters were obtained through fitting between the experimental data and the curing models. The reaction process shows to be dominated by a different mechanism at different stages of the E-51/CYD-011 system curing process:when the cure degree was less than 0.5, the curing system was an autocatalytic reaction model;when the cure degree was more than 0.5, the curing system was an nth order reaction model, with an initial autocatalytic reaction shifting into an nth order reaction as the reaction proceeding. After the change, the reaction activation energy decreased.