动态热机械法研究天然橡胶硫化胶的热氧老化性能

Study of Thermo-Oxidizing Aging of NR With Dynamic Mechanical Thermal Analyses Technique

介绍了用动态热机械分析仪测定天然橡胶(NR)硫化胶耐老化性能的原理及方法。通过测定胶料在160℃、恒温30 m in下的动态模量谱,来评估硫化胶的耐老化性能。同时测定硫化胶力学性能随老化时间的变化情况。结果显示:老化后储能模量减少,损耗模量和损耗因子tanδ总体呈增加趋势。力学性能随老化时间的延长呈先增加而后下降趋势。

The principle and the dynamic mechanical thermal analyses and application of NR vulcanizate are reviewed. The thermo-oxidative aging of rubber by DMA curve is evaluated. Result indicates storage modulus decreases after aging, but in a whole, loss modulus and tanδ increase. Mechanical properties increase at first, then decrease with increasing aging time.