聚酰亚胺纤维的表面改性及其环氧树脂复合材料性能与界面破坏模式  

Properties and interfacial failure mode of surface modified polyimide fiber/epoxy composites

作　　者：邱杨 李亚锋 田国峰[2] 张梦颖 QIU Yang;LI Yafeng;TIAN Guofeng;ZHANG Mengying(Composite Technology Center,AVIC Manufacturing Technology Institute Beijing 101300,China;Key Laboratory of Carbon Fiber and Functional Polymers(Ministry of Education),Beijing University of Chemical Technology,Beijing 100029,China;Jiangsu Shino New Materials Technology Co.,Ltd.,Changzhou 213146,Jiangsu,China)

机构地区：[1]中国航空制造技术研究院复合材料技术中心,北京101300 [2]北京化工大学碳纤维及功能高分子教育部重点实验室,北京100029 [3]江苏先诺新材料科技有限公司,江苏常州213146

出　　处：《材料工程》2024年第12期196-203,共8页Journal of Materials Engineering

摘　　要：针对聚酰亚胺(PI)纤维低表面能及PI纤维/环氧树脂复合材料界面性能差的问题,采用大气等离子体处理技术对PI纤维进行表面改性,以处理时间为变量,研究大气等离子体表面处理对PI纤维表面结构及PI/环氧树脂复合材料界面性能的影响。通过SEM研究等离子体处理对PI纤维表面介观形貌及其复合材料破坏模式的影响,采用动态接触角及丝束横向拉伸强度测试对等离子体处理前后的PI纤维与环氧树脂的浸润效果及界面性能进行表征,选取弯曲强度及层间剪切强度作为PI纤维增强复合材料力学性能考察项目。结果表明:大气等离子体表面处理能够改善PI纤维与环氧树脂的浸润及界面结合状态,处理时间为6 min的PI纤维丝束横向拉伸强度为16.05 MPa,提升近21%;PI/环氧树脂复合材料弯曲及层间剪切强度的增幅分别达36.41%及38.85%。大气等离子体改性能够对PI纤维表面形貌进行重构,优化PI纤维与环氧树脂复合效果,将PI纤维增强复合材料的破坏模式由界面破坏转变为纤维表面及皮层破坏。To solove the problem of the low surface energy of polyimide(PI)fiber and poor interfacial performance between PI fiber and epoxy,atmospheric air plasma was selected to modify the surface of PI fiber.The influence of treatment duration on the surface structure of PI fiber and the interfacial properties of PI/epoxy composites was investigated.Effects of atmospheric air plasma on the surface micromorphology of PI fiber and failure plane of PI/EP composites were observed by the SEM.Dynamic contact angle and lateral tow tensile strength tests were chosen to characterize the infiltration effect and interfacial performance between PI fiber and epoxy after plasma treatment.The flexural strength and interlaminar shear strength tests were selected as inspection items for composites performance.The results implicate that atmospheric air plasma treatment can increase the infiltration and interfacial connection between PI fiber and epoxy,the lateral tow tensile strength of PI fiber modified by plasma treatment for 6 min is 16.05 MPa,with increment of nearly 21%.The increases in flexural strength and interlaminar shear strength of PI/EP composites are 36.41%and 38.85%respectively.Atmospheric air plasma modification can remake the surface morphology of PI fiber,and improve the joining effect of PI fiber and epoxy.Furthermore,the failure model of PI/EP composites is transformed from interfacial failure to fiber surface failure.

关 键 词：聚酰亚胺(PI)纤维 等离子体改性 复合材料 界面 环氧树脂 

分 类 号：TB332[一般工业技术—材料科学与工程]