CFRP复合材料板材的耐水酸碱性能研究  

Hygrothermal resistance of CFRP composites in water, acid andalkali environments

作　　者：韩庆 韩玮 刘海波 刘延峰 杨超 王少强 咸贵军[2] HAN Qing;HAN Wei;LIU Haibo;LIU Yanfeng;YANG Chao;Wang Shaoqiang;XIAN Guijun(Technology Inspection Center of Shengli Oilfield,SINOPEC,Dongying 257000,China;School of Civil Engineering,Harbin Institute of Technology(HIT),Harbin 150090,China)

机构地区：[1]中国石油化工股份有限公司胜利油田分公司技术检测中心,山东东营257000 [2]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090

出　　处：《西安建筑科技大学学报（自然科学版）》2024年第1期93-102,共10页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：中国石化科技攻关项目(420075-1)。

摘　　要：腐蚀环境下碳纤维增强环氧树脂(CFRP)复合材料的性能退化是影响材料与结构安全服役的关键.为获得CFRP板材在腐蚀溶液中的耐久性能,将CFRP板材浸泡在水、酸与碱溶液中长达150 d.通过水吸收、热力学测试与微观结构分析获得CFRP板材的长期性能演化.结果表明:树脂板与CFRP板材在水、酸与碱溶液中的水吸收行为类似.在酸溶液中,树脂板与CFRP板材均获得较高的水吸收量,这是因为酸溶液促进了树脂的松弛作用,为水分子的进一步侵入提供了更多的扩散空间.此外,树脂的水解作用降低了树脂板与CFRP板材水吸收量.长期的加速老化导致CFRP板材拉伸强度退化高达29.7%,玻璃化转变温度退化高达12.4%.CFRP板材拉伸强度的退化主要由树脂的塑化与水解、纤维与树脂界面的脱粘所导致.碱溶液加速纤维与树脂界面脱粘、树脂水解,这导致碱溶液浸泡下的CFRP板材拉伸强度退化远大于水与酸溶液,其纤维与树脂界面完整性最差,纤维表面没有树脂残留.CFRP板材玻璃化转变温度的退化主要受控于树脂的塑化.酸溶液下玻璃化转变温度的退化程度远大于水与碱溶液,这是因为酸溶液下CFRP板材拥有更高的吸水率,导致树脂发生更严重的塑化作用.The degradation of carbon fiber reinforced epoxy polymer(CFRP)composites in corrosive environment is the key to the service security of materials and structures.In order to obtain the aging resistance of CFRP plate in corrosive solution,CFRP plate is immersed in water,acid and alkali solution for 150 days.The long-term performance evolutions of CFRP plate are obtained by water absorption,thermal and mechanical tests,microstructure analysis.The results show that the water absorption behavior of resin plate is similar to that of CFRP plate in water,acid and alkali solution.In the acid solution,both the resin and CFRP plate have higher water absorption,which is because the acid solution promotes the resin relaxation and provides more space for the further ingress of water molecules.In addition,the resin hydrolysis reduces the water absorption of resin and CFRP plate.The long-term accelerated aging leads to a degradation of up to 29.7%in the tensile strength and 12.4%in the glass transition temperature of CFRP plates.The resin plasticization and hydrolysis,the interface debonding between fiber and resin are the main factors causing the degradation of tensile strength of CFRP plate.The alkali solution accelerates the debonding of the fiber resin interface and resin hydrolysis,which leads to a much greater degradation of the tensile strength of CFRP sheets soaked in alkaline solution than in water and acid solution.The glass transition temperature of CFRP plate is mainly controlled by the resin plasticization.The degradation degree of glass transition temperature in acid solution is much greater than that of water and alkali solution,which is because CFRP plate has higher water absorption in acid solution,resulting in more serious resin plasticization.

关 键 词：CFRP复合材料 腐蚀溶液 性能演化 树脂塑化与水解 界面脱粘 

分 类 号：TU532[建筑科学—建筑技术科学]