聚吡咯共轭结构对碳纤维增强树脂基复合材料热循环稳定性能的影响  

Effect of pyrrole-conjugated structure on the thermal cycle stability of carbon fiber reinforced resin-based composites

作　　者：姜梦敏 王一璠 金欣[1] 王闻宇[2] 肖长发[1,3] JIANG Mengmin;WANG Yifan;JIN Xin;WANG Wenyu;XIAO Changfa(School of Materials Science and Engineering,Tiangong University,Tianjin 300387,China;School of Textile Science and Engineering,Tiangong University,Tianjin 300387,China;Shanghai University of Engineering Science,Shanghai 201620,China)

机构地区：[1]天津工业大学材料科学与工程学院,天津300387 [2]天津工业大学纺织科学与工程学院,天津300387 [3]上海工程技术大学,上海201620

出　　处：《纺织学报》2024年第10期23-30,共8页Journal of Textile Research

基　　金：国家自然科学基金项目(51573136)。

摘　　要：为解决碳纤维增强树脂基复合材料(CFRPs)存在的碳纤维与基体间界面黏结性较弱和在热循环过程中因热膨胀系数不匹配而产生界面破坏的问题,通过低温聚合得到含有较多共轭结构的聚吡咯(PPy)对预处理后碳纤维(CF)进行表面改性,分别在0、30、60℃下制得碳纤维/聚吡咯复合纤维(PPy/CF),并研究了不同聚合温度下制备的CFRPs的界面结合性能、热膨胀性能和热循环稳定性能。结果表明:PPy/CF-0纤维的表面粗糙度与CF相比增加了2.09倍,这有利于树脂锚定在碳纤维表面,从而提高界面结合性能;并且PPy/CF-0纤维表面的聚吡咯层具有较完善的共轭结构,整体表现为负热膨胀系数,使得复合材料的层间剪切强度和界面剪切强度分别达到了CF的1.56倍和1.70倍;此外还使得CFRPs的热循环稳定性有了较明显的提升,经100次热循环实验后,其剪切强度仍能保持在初始数值的70%以上。Objective Carbon fiber(CF)reinforced resin matrix composites(CFRPs)have attracted much research attention in due to their good overall performance.However,CFRPs suffer from the problems of weak interfacial bonding between carbon fibers and matrix,and the mismatch of thermal expansion coefficients of the two phase materials brings about interfacial damage during thermal cycling.Existing interfacial modification techniques are difficult to solve the above two problems,and therefore a new solution is proposed in this paper.Method Optimization of interfacial properties of composites was carried out based on structural adjustment of polypyrrole(PPy)to achieve surface modification by polymerizing a layer of PPy on carbon fiber.The PPy layer with more conjugated structure was obtained by adjusting different polymerization temperature.The interfacial bonding property,thermal expansion property and thermal cycling stability of CFRPs prepared under different polymerization conditions were studied.Results The results showed that the surface roughness of PPy/CF-0 fibers polymerized at 0℃was higher than that of CF by a factor of 2.09,which was conducive to the anchoring of the epoxy resin on the surface of carbon fibers.Moreover,the PPy on the surface of PPy/CF-0 fibers showed a higherα-αconjugate structure,which led to the negative coefficient of thermal expansion of the composites,and increased the interlayer shear strength and interfacial shear strength of the composites by a maximum of 60 MPa and 47.5 MPa,respectively.The PPy/CF-0 fiber composites also demonstrated excellent thermal cycling stability,and the shear strength was still maintained at more than 70%of the initial value after 100 thermal cycling tests.Conclusion Compared with unmodified CF,the interlaminar shear strength(ILSS)and interfacial shear strength(IFSS)of PPy/CF-0 fiber-reinforced composites modified by PPy coating reached 88.9 MPa and 65.4 MPa,respectively,which were 1.56 and 1.70 times higher compared with CF,and the shear strength was maintained

关 键 词：碳纤维增强树脂基复合材料 聚吡咯 界面结合性能 负热膨胀系数 热循环稳定性 聚合温度 

分 类 号：TS101[轻工技术与工程—纺织工程] TB332[轻工技术与工程—纺织科学与工程]