动态热机械分析法在材料耐老化性能分析中的应用  

Application of Dynamic Mechanical Analysis in the Aging-Resistant Performance Analysis of Polymers

作　　者：孟祥艳[1] 魏莉萍[1] 刘运传[1] 周燕萍[1] 王雪蓉[1] 郑会保[1] 段剑[1] 郑素萍[1] 

机构地区：[1]中国兵器工业集团第五三研究所,山东济南250031

出　　处：《高分子材料科学与工程》2013年第11期76-78,83,共4页Polymer Materials Science & Engineering

摘　　要：采用动态热机械分析法对热老化不同时间的尼龙66(PA66)进行性能表征,并与差示扫描量热分析和缺口冲击实验的结果相认证,结果表明,损耗因子、储能模量、储能柔量等参数随热老化时间的延长有规律地变化。随热老化时间的延长,损耗因子主转变峰温先升高后下降,热老化后期变化趋于平缓。储能柔量不断减小,热老化初始阶段变化较小,后有一个突变。利用动态热机械分析中参数的变化可有效地评价高聚物材料的耐老化性能,并且可以进一步从分子运动角度及材料的模量上对热老化机理进行分析。PA66 with different aged time was characterized by dynamic mechanical analysis （DMA）. The mechanisms of DMA analysis were identified with the results of DSC curves and impact strength test. The results indicate that dynamic parameters such as loss tangent, storage modulus and storage compliance have a regular change along with the prolongation of aged time. The maximum temperature of main relaxation loss tangent increases first and then decreases, and becomes stable at the last stage of thermal aging. The storage compliance constantly decreases with the prolongation of aged time. It is a practicable way to characterize the aging-resistant performance of polymer by DMA analysis, moreover the polymers aging mechanism can be concluded according to molecular movement and dynamic parameters.

关 键 词：动态热机械分析 耐老化性能 损耗因子 储能模量 储能柔量 老化机理 

分 类 号：TQ317.3[化学工程—高聚物工业]