新型环氧树脂体系固化动力学及其碳纤维复合材料性能研究

Study on the curing kinetics of new epoxy resin system and the properties of carbon fiber composites

以多官能环氧树脂TDE-85、E-51环氧树脂、活性稀释剂和固化剂为主要原材料,制备了一种中高温固化的环氧树脂。采用非等温差示扫描量热(DSC)法研究树脂固化行为,利用Kissinger和Crane方程求得该树脂的固化反应动力学参数,并使用T-β外推法得到该树脂的最佳固化温度,从而建立了该环氧树脂体系的固化动力学模型。在此基础上,以该树脂为基体,T800碳纤维为增强相,采用缠绕模压工艺制得复合材料单向板及NOL环。利用扫描电镜(SEM)观察复合材料的微观形貌,通过动态机械热分析仪发现T800碳纤维/EP复合材料的储能模量随温度的升高而降低,损耗因子峰值对应的玻璃化转变温度为137℃。复合材料单向板在室温下的拉伸强度为2784MPa,NOL环在350℃下的拉伸强度为1349MPa,其拉伸强度随温度的增加而减小。

Using multifunctional epoxy resin TDE-85,E-51 epoxy resin,reactive diluent and curing agent as the main raw materials,a medium-high temperature curing epoxy resin was prepared.The curing behavior of the resin was studied by non-isothermal differential scanning calorimetry(DSC)method,the kinetic parameters of the curing reaction of the resin were obtained by the Kissinger and Crane equations,and the optimal curing temperature of the resin was obtained by T-βextrapolation.Thus,the curing kinetic model of the epoxy resin system was established.On this basis,using the resin as the matrix and T800 carbon fiber as the reinforcing phase,the composite material unidirectional plate and the NOL ring were prepared by the winding molding process.The microscopic morphology of the composite was observed by SEM.The dynamic mechanical thermal analysis revealed that the storage modulus of the T800 carbon fiber/EP composite decreased with the increase of temperature,and the glass transition temperature corresponding to the peak loss factor was 137℃.The tensile strength of the composite unidirectional plate at room temperature was 2748MPa,and the tensile strength of the NOL ring at 350℃was 1349MPa,and its tensile strength decreased with the increase of temperature.