表面官能化对热塑性涂层改性炭纤维表界面性质的影响  

Effect of surface functionalization on the surface and interfacial properties of thermoplastic-coated carbon fibers

作　　者：苏亚男[1,2,3] 经德齐 张兴华[1,3] 张寿春[1,2,3] SU Ya-nan;JING De-qi;ZHANG Xing-hua;ZHANG Shou-chun(National Engineering Laboratory for Carbon Fiber technology,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;Shanxi Engineering Research Center of Advanced Thermoplastic Composites,Chinese Academy of Sciences,Taiyuan 030001,China)

机构地区：[1]中国科学院山西煤炭化学研究所碳纤维制备技术国家工程实验室,山西太原030001 [2]中国科学院大学材料与光电研究中心,北京100049 [3]中国科学院山西煤炭化学研究所山西省热塑性先进复合材料工程研究中心,山西太原030001

出　　处：《新型炭材料》2021年第6期1169-1178,共10页New Carbon Materials

基　　金：中科院青年创新促进会(Y201646);中国科学院战略性先导科技专项(A类)子课题(XDA17040519);山西省重点研发计划项目(202003D111002,201803D121042).

摘　　要：本文利用混酸氧化以及乙二胺接枝的方法得到羟基和氨基官能化炭纤维(CF―OH和CF―NH_(2)),之后进行磺化聚醚醚酮上浆处理,制备了热塑性上浆剂涂层改性的功能化炭纤维(CF―OH―SPEEK以及CF―NH_(2)―SPEEK),并研究表面官能团对热塑性涂层改性炭纤维表面以及复合材料界面性质的影响。结果表明,经表面功能化处理后,炭纤维的表面官能团含量以及表面润湿能力得到了明显的提高。核磁氢谱分析显示,引入的—OH、—NH_(2)等基团与磺化聚醚醚酮发生化学反应,提高炭纤维和上浆涂层之间的结合能力。因此,与磺化聚醚醚酮直接涂层改性的退浆炭纤维(Desized-SPEEK)相比,CF―OH―SPEEK以及CF―NH_(2)―SPEEK与聚醚醚酮复合时界面剪切强度分别提高了6.2%和14.0%,证明表面功能化处理有利于提高热塑性涂层改性的炭纤维复合材料的界面结合能力。Hydroxyl-and amino-functionalized carbon fibers(CF―OH and CF―NH_(2))were prepared by surface oxidation with an acid mixture(H_(2)SO_(4)∶HNO_(3) of 3∶1 v/v)followed by grafting with ethylenediamine.The functionalized CFs were sized with a sulfonated poly(ether ether ketone)(SPEEK)sizing agent to prepare CF―OH―SPEEK and CF―NH_(2)―SPEEK materials.The effect of surface functionalization on the surface properties of the CFs and their interfacial properties in PEEK matrix composites were investigated.Results showed that the content of polar functional groups and wettability of the CFs increased significantly after surface functionalization.Chemical reactions between the modified CFs and the sizing agent,improved the interfacial adhesion between them.The interfacial shear strengths of CF―OH―SPEEK and CF―NH_(2)―SPEEK reinforced PEEK matrix composites were increased by 6.2%and 14.0%,respectively,compared with that of the composites reinforced with desized-SPEEK CFs.The surface functionalization helps improve the interfacial adhesion of thermoplastic-coated CF/PEEK composites.

关 键 词：炭纤维 聚醚醚酮 表面功能化 表面性能 界面剪切强度 

分 类 号：TQ342.7[化学工程—化纤工业]