碳纤维表面处理对碳纤维/聚丙烯复合材料界面结合性能的影响  

EFFECT OF CARBON FIBER SURFACE TREATMENT ON INTERFACIAL BONDING PERFORMANCE OF CARBON FIBER REINFORCED POLYPROPYLENE COMPOSITES

作　　者：徐胜 黄雪飞 杨斌[1] XU Sheng;HUANG Xue-fei;YANG Bin(School of Chemistry and Chemical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学化学化工学院,上海200240

出　　处：《复合材料科学与工程》2021年第1期65-71,共7页Composites Science and Engineering

基　　金：国家重点计划“新能源”汽车专项(2016YFB0101700);上海市科委高新技术领域项目(18511109000)。

摘　　要：研究了电化学氧化、环氧上浆处理对碳纤维/聚丙烯(CF/PP)复合材料界面结合性能的影响,首先通过AFM、XPS等测试不同碳纤维的表面形貌和化学性质,然后借助微球脱粘实验考察对比不同CF/PP的界面剪切强度(IFSS)。结果显示高温碳化后的碳纤维表面呈惰性,复合材料IFSS仅有3.76 MPa;经过电化学氧化处理,表面粗糙度增大,羟基和羧基基团增多,IFSS增加到4.85 MPa;上浆处理后,表面引入活性的环氧基团,IFSS进一步增加到5.51 MPa,同时界面均匀性也有所改善。根据结果分析,碳纤维表面性质改变引起的界面区域机械锁合、范德华力以及分子链缠结作用增加是界面性能提升的主要原因。但与相容剂相比,传统碳纤维表面处理对CF/PP界面改善效果相对较弱,开发更加有效的改性方法十分必要。Interfacial modification acts as an important link to promote the development of thermoplastic carbon fiber reinforced composites.In this article,the effects of electrochemical oxidation and epoxy sizing on the interfacial bonding performance of carbon fiber/polypropylene composites(CF/PP)were studied.The surface morphology and chemical properties of a series of carbon fibers were first characterized by AFM,XPS,etc.and then the interfacial shear strength(IFSS)of these CF/PP were tested by microdroplet debonding experiments.The results show that high temperature carbonization make carbon fiber surface inert,and the IFSS of composites is only 3.76 MPa.The IFSS increased to 4.85 MPa after electrochemical oxidation as the roughness and the number of hydroxyl and carboxyl groups on the surface increased.The IFSS was further enhanced to 5.51 MPa after epoxy sizing with the introduction of a large number of active epoxy groups to the surface,which also exhibited higher interfacial uniformity.It is believed that it is the increase of mechanical interlocking,van der Waals force,and intermolecular entanglement caused by changes in the surface properties that are the dominant reasons for the improvement of CF/PP interfacial bonding performance.Compared with compatibilizer,traditional surface treatment of carbon fiber exerted a weak improvement on the CF/PP interfacial performance.Therefore,there is still great potential for improving the CF/PP interfacial bonding performance through developing more effective surface modification methods combined with compatibilizer.

关 键 词：碳纤维 聚丙烯 界面 微球脱粘 复合材料 

分 类 号：TB332[一般工业技术—材料科学与工程]