聚醚醚酮水性上浆剂对碳纤维热塑性复合材料界面性能的影响

Effect of polyetherketone water-based sizing on interface properties of CFs/PEEK composites

为了提高碳纤维(CFs)热塑性树脂基复合材料的界面性能,采用以相反转乳化法制备的聚醚醚酮(PEEK)水性上浆剂对CFs进行上浆处理,然后通过手糊热压的方式制备CFs/PEEK树脂热塑性复合材料,研究上浆剂乳液浓度与上浆剂的附着量对CFs及其热塑性复合材料界面性能的影响。结果表明:当PEEK上浆剂在水乳液中质量分数为2%时,乳液的表面张力具有最小值29.2 mN/m,PEEK上浆剂乳液具有最佳的表面润湿与铺展性能,PEEK上浆剂的最佳附着量为6 mg/g;采用此上浆工艺条件上浆后的CFs表面氧元素质量分数增加到19.51%,CFs复丝断裂强度较原厂上浆CFs提高了23.7%,制备的CFs/PEEK复合材料拉伸强度、弯曲强度和层间剪切强度比未上浆改性的分别提高了58.37%、37.01%和47.53%。与基体树脂同质的PEEK复合型水性上浆剂能明显改善CFs/PEEK复合材料的界面黏结性能,显著提高CFs/PEEK的整体力学性能。

In order to improve the interfacial properties of carbon fibers(CFs)thermoplastic resin composites,CFs was sized with poly ether ether ketone(PEEK)aqueous sizing agent prepared by phase inversion emulsification technique,and then CFs/PEEK thermoplastic composites were prepared by hand lay-up hot pressing.The effects of the water emulsion concentration and the amount of sizing agent on the interfacial properties of carbon fibers and its thermo-plastic composites were studied.The results show that when the mass fraction of PEEK sizing agent is 2%in water emulsion,the minimum surface tension of the emulsion is 29.2 mN/m,and this concentration of PEEK sizing agent has the best surface wetting and spreading properties,the optimal application amount of PEEK sizing agent is 6 mg/g.Under these sizing conditions,the surface oxygen content of the carbon fibers increased to 19.51%,and the fracture strength of the carbon fibers composites was 23.7%higher than that of the original sized carbon fiber.The tensile strength,flexural strength and interlaminar shear strength of the prepared CFs/PEEK composites are increased by 58.37%,37.01%and 47.53%,respectively,compared with the composites prepared by the carbon fibers unmodified.The PEEK composites sizing agent,which is homogeneous with the base resin,can significantly improve the interfacial bonding property of the CFs/PEEK composites material and the overall mechanical strength of the carbon fibers composite material.