水溶性环氧上浆剂对碳纤维复合材料性能影响

EFFECT OF WATERBORNE EPOXY SIZING AGENT ON PROPERTIES OF CARBON FIBER COMPOSITES

以邻苯二甲酸酐、聚乙二醇2000和环氧树脂E51为原料,制备了水性环氧树脂型上浆剂,使用真空袋成型工艺制备了碳纤维环氧树脂复合材料。分别从热稳定性、接触角表面自由能、碳纤维表面形貌及其复合材料断面形貌和力学性能等方面研究了上浆后的碳纤维环氧复合材料性能。结果表明:上浆剂分解温度在300℃左右时,上浆后的碳纤维热稳定性好;与水的接触角从71.4°降低到65.1°,表面自由能从32.2 mN/m增加到了38.9 mN/m;其环氧树脂复合材料层间剪切强度(ILSS)在上浆质量分数为6wt%时达到最大值(88.6 MPa),相比未上浆碳纤维(80.3 MPa)提高了10.3%。

A kind of aqueous epoxy resin sizing agent was made by the reaction of phthalic anhydride,polyethylene glycol 2000 and epoxy resin E51.Carbon fiber epoxy resin composite material was prepared by the way of vacuum bag molding process.The properties of the carbon fiber epoxy composites after sizing were estimated by thermal stability,the free energy of the contact angle surface,the surface and composite material section morphology,and interlaminar shear strength(ILSS).The results show that carbon fibers were successfully modified by sizing agent,the decomposition temperature of the sizing agent is about 300℃;the contact angle with water decreased from 71.4°to 65.1°,and the surface free energy increased from 32.2 mN/m to 38.9 mN/m;the interlaminar shear strength of the epoxy resin composite reached a maximum value(88.6 MPa)at sizing agent mass fraction of 6 wt%,which increased by 10.3%compared with the unsized carbon fiber(80.3 MPa).