超高分子量聚乙烯纤维及其复合材料的热氧老化行为  

Thermo-oxidative Aging Behavior of Ultra-high Molecular Weight Polyethylene Fiber and Its Composites

作　　者：黄献聪 来悦 李常胜 李伟萍 龙知洲 马天 HUANG Xiancong;LAI Yue;LI Changsheng;LI Weiping;LONG Zhizhou;MA Tian(Institute of system Engineering,Academy of Military Science,Beijing 100010,China)

机构地区：[1]军事科学院系统工程研究院,北京100010

出　　处：《兵工学报》2022年第12期3211-3220,共10页Acta Armamentarii

摘　　要：通过傅里叶变换红外光谱仪、差示量热扫描仪、动态热机械分析仪、万能强力试验机及扫描电镜测试手段探究超高分子量聚乙烯(UHMWPE)纤维及UHMWPE纤维/氢化苯乙烯-丁二稀-苯乙烯嵌段共聚物(SEBS)复合材料的热氧老化机理,系统分析老化温度对UHMWPE纤维及其复合材料的结构和热性能、界面性能、机械强度和防弹性能的影响。研究结果表明:老化后的UHMWPE纤维机械性能与热氧老化温度密切相关,经高温热氧老化后拉伸强度显著下降,但纤维结晶结构基本不变;UHMWPE纤维/SEBS复合材料在70℃和90℃热氧老化336 h后纤维与树脂界面已发生破坏;在90℃热氧老化672 h后,UHMWPE复合材料弯曲强度和弯曲模量分别下降了28%和49%;然而,在50℃、70℃及90℃下热氧老化1344 h后,UHMWPE复合材料防1.1 g标准模拟破片的弹道极限速度v_(50)保持率均高于95%。The structure and performance of UHMWPE fibers and UHMWPE fiber/SEBS composites before and after thermal oxygen aging were analyzed by FTIR,DSC,DMA,universal testing machine and SEM.The results show that the mechanical properties of the UHMWPE fiber after aging are closely related to the thermo-oxidative aging temperature;the tensile strength of the fiber decreases significantly after high-temperature thermo-oxidative aging,but the crystalline structure of the fiber is not affected;the interface of fiber and resin of UHMWPE fiber/SEBS composites was damaged after thermal-oxidative aging at 70℃and 90℃for 336 h(2 weeks);the flexural strength and flexural modulus of the composites decreased 28%and 49%respectively after thermal-oxidative aging at 90℃for 672 h(4 weeks).However,after 8 weeks of thermo-oxidative aging at 50℃,70℃and 90℃,the retention rate of the ballistic limit velocity v_(50) using 1.1 g standard simulating fragments against the composites was higher than 95%.

关 键 词：热氧老化 UHMWPE纤维 UHMWPE复合材料 防弹测试 

分 类 号：TB333.2[一般工业技术—材料科学与工程]