吸湿老化后碳纤维增强乙烯基脂树脂复合材料高低温力学性能  

Mechanical properties at elevated and cryogenic temperatures of carbon fiber reinforced vinylester resin composites after hygroscopic aging

作　　者：魏建辉 刘明 高进城 张裕恒 丁安心 WEI Jianhui;LIU Ming;GAO Jincheng;ZHANG Yuheng;DING Anxin(Wuhan Second Ship Design and Research Institute,Wuhan 430061,China;School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉第二船舶设计研究所,武汉430061 [2]武汉理工大学材料科学与工程学院,武汉430070 [3]武汉理工大学材料复合新技术国家重点实验室,武汉430070

出　　处：《复合材料学报》2023年第6期3279-3290,共12页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(11902231)。

摘　　要：碳纤维增强乙烯基酯树脂复合材料(CFRP)是海洋和舰船工程领域广泛应用的结构材料,在复杂海洋环境和服役工况下,材料面临湿热和极端温度的考验。本文研究了树脂和CFRP在水浴过程中的质量和形貌变化及水浴吸湿后CFRP在3种测试温度下(−30℃、室温和70℃)的力学性能演变。FTIR和液相色谱-质谱联用实验结果表明乙烯基酯树脂在水浴过程中发生了水解,而吸湿后CFRP的微观形貌观察表明纤维-基体界面的存在会改变树脂基体的吸湿行为。低温、高温和水浴120天后室温测试环境下,CFRP的压缩强度相比未吸湿试样的室温初始强度,分别降低了27.4%、36.2%和32.8%;而低温环境下面内剪切强度提升了35%,高温环境下降低了27%,水浴120天后提升了7%,显示温度对CFRP面内剪切强度的影响大于湿热老化。此外,动态热力学性能测试显示初始阶段的吸湿会导致CFRP储能模量和玻璃化转变温度(Tg)降低,但后期储能模量和Tg会部分恢复。Carbon fiber reinforced vinylester resin composites(CFRP)are widely used as structural materials in ocean and ship engineering.In an unpredictable ocean environment and service condition,materials are subjected to hygroscopic environment and extreme temperatures.In this paper,the weight change and morphology changes of resin matrix and CFRP after immersion into water as well as the development of mechanical properties for CFRP during immersion duration at three temperatures(−30℃,room temperature and 70℃)were studied.The results from FTIR and liquid chromatography-mass spectrometry showed that the vinylester resin was hydrolyzed during immersion,and observations on the microscopic morphology revealed that the formation of fiber-matrix interface changed the moisture absorption behavior of resin matrix.The compressive strength of CFRP at cryogenic temperature and elevated temperature as well as at room temperature after 120 days’immersion decreased by 27.4%,36.2%and 32.8%as compared to the unaged strength at room temperature,respectively.And the in-plane shear strength increased by 35%at low temperature,decreased by 27%at elevated temperature,and increased by 7%after 120 days’immersion,showing that the influence of temperature on the in-plane shear strength of CFRP was greater than that of hygroscopic aging.Meanwhile,the results from dynamic thermomechanical analysis displayed that the storage modulus and glass transition temperature(Tg)declined due to the moisture absorption,but later recovered partially.

关 键 词：碳纤维增强树脂复合材料 乙烯基树脂 湿热老化 水解 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]