环氧乙烯基酯树脂及其复合材料高温高压矿化水条件下老化性能研究  

Research on the aging properties of epoxy vinyl resin and its composite materials under high temperature and high pressure mineralized water conditions

作　　者：李风 王亭沂[1,2] 张瑾 范路[1,2] 杨成瑞 时宪 LI Feng;WANG Ting-yi;ZHANG Jin;FAN Lu;YANG Cheng-rui;SHI Xian(Technical Testing Center of Sinopec Shengli Oil Fields Branch,Dongying 257000,China;Test Assessment and Research Co.,Ltd.,Sinopec Shengli Oilfield,Dongying 257000,China;College of Material Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,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,东营257000 [2]中国石油化工股份有限公司胜利油田检测评价研究有限公司,东营257000 [3]北京化工大学材料科学与工程学院,北京100029

出　　处：《复合材料科学与工程》2022年第8期82-88,共7页Composites Science and Engineering

基　　金：中石化集团项目,碳/玻纤维复合储罐、管道材料老化机理研究(KL20043)。

摘　　要：制备环氧乙烯基酯树脂及其玻璃纤维增强复合材料,对其进行高温高压(70℃+5 MPa)矿化水老化试验,研究纯树脂、树脂基复合材料在高温高压矿化水老化条件下的性能劣化趋势及其老化机理。研究发现:老化后材料的力学性能出现大幅度降低,经老化49 d后复合材料的剩余拉伸强度为56.79%,环氧乙烯基酯的拉伸强度仅为27.30%;老化前后,环氧乙烯基酯的特征官能团发生变化,发生了酯基的水解、材料内部形成氢键等物理化学反应,对材料性能产生不利影响;环氧乙烯基酯的FTIR以及XPS数据表明树脂的老化程度从材料的表面沿厚度方向逐渐减弱;SEM结果表明,环氧乙烯基酯在老化过程中断裂失效模式从韧性断裂慢慢转变为脆性断裂,在复合材料内部还发生了界面脱黏现象;树脂及复合材料的DMA数据显示,由于老化后树脂分子链的断裂以及水分子的增塑效应,复合材料的玻璃化温度降低并且储能模量发生了变化。In this study,the epoxy vinyl ester resin and its glass fiber reinforced composite materials have been successfully prepared,and the mineralized water aging test under high temperature and high pressure(70℃+5 MPa)has been conducted to investigate the performance of the degradation as well as the aging mechanism under high temperature and high pressure conditions.It has been found that the mechanical properties of as-prepared resin and composite materials are greatly influenced due to the aging.For instance,after 49 days of aging,the stretching of the composite material dropped to 56.79%.Meanwhile,the residual tensile strength of epoxy vinyl ester was only 27.30%.The characteristic functional groups of the ester within the resin significantly changed during the aging,due to hydrolysis of the ester groups as well as the formation of hydrogen bonds leading to the reduction of the mechanical properties of the materials.According to FTIR and XPS results,the degree of aging gradually decreased from the surface into the interior of the materials.From SEM,it was shown that the fracture failure mode of epoxy vinyl ester gradually changed from ductile fracture to brittle fracture as the aging was processed.In addition,the interfacial debonding occurred within the composite material matrix.In the end,the DMA results indicated that the rupture of the resin molecular chain after aging,as well as the plasticizing effect of water molecules,led to the decreasing of the glass transition temperature and the storage modulus of the composite materials.

关 键 词：环氧乙烯基酯 复合材料 老化 强度 微观形貌 

分 类 号：TB332[一般工业技术—材料科学与工程]