微孔聚氨酯弹性体疲劳性能研究

Fatigue properties of microporous polyurethane elastomer

以WJ-8 B型微孔聚氨酯弹性体为研究对象,采用傅立叶变换红外光谱仪、动态力学分析仪、扫描电子显微镜、热重分析仪、示差扫描量热仪和拉伸试验机仪对历经300万次疲劳的微孔聚氨酯弹性体进行测试和表征。结果表明:疲劳后弹性体软段最大热失重速率对应温度由420℃降低到410℃,弹性体在-20℃以下的储能模量有所降低,而力学性能、阻尼因子、玻璃化转变温度、泡孔结构及分布、化学键结构较疲劳前无明显变化,该微孔聚氨酯弹性体具备良好的抗疲劳性能。

The WJ-8 B microporous polyurethane elastomer was choosed as the research object,the Fourier transform infrared spectrometer,dynamic mechanical analyzer,scanning electron microscope,thermogravimetric analyzer,differential scanning calorimeter and tensile tester were used to test and characterize the properties of the microporous polyurethane elastomer before and after 3 million times of fatigue. The results showed that the temperature corresponding to the maximum thermal weight loss rate of the soft section of the polyurethane elastomer after fatigue was decreased from 420 ℃ to 410 ℃. The energy storage modulus was decreased when the temperature was below-20 ℃. The mechanical properties,damping factor,glass transition temperature,cell structure and distribution,chemical bond structure of the polyurethane elastomer after fatigue had no obvious changes compared with those of before fatigue and the microporous polyurethane elastomer had good fatigue resistance performance.