PMMA在玻璃化温度以上单轴压缩力学性能研究  

Mechanical Behavior of PMMA Above the Glass Transition Temperature Under Uniaxial Compression

作　　者：冯维娜[1,2,3] 张响[1,2,3] 张勤星[1,2,3] 王市伟[1,2,3] 孙冰丽[1,2,3] 李倩[1,2,3] 

机构地区：[1]郑州大学力学与工程科学学院,河南郑州450001 [2]河南省微成型技术重点实验室,河南郑州450001 [3]河南省微纳成型技术国际联合实验室,河南郑州450001

出　　处：《中国塑料》2013年第11期66-70,共5页China Plastics

基　　金：国家重点基础研究发展计划(973计划)资助(2012CB626809)

摘　　要：研究了无定形聚合物聚甲基丙烯酸甲脂（PMMA）在单轴压缩条件下，温度高于玻璃化转变温度，在110～130℃温度范围内，其力学性能随温度和应变率的变化规律。结果表明，PMMA具有对温度的敏感性，其屈服应力随着温度的升高而降低，表现为温度软化效应；当温度超过120℃屈服峰消失，表现出良好的塑性；PMMA也具有明显的应变率相关性，在0．001~0．1S。应变率范围内，随着应变率提高应变硬化加强。The uniaxial compression behavior of amorphous polymethylmethacrylate （PMMA） was studied between 110 ℃and 130 ℃. It showed that PMMA was sensitive to the temperature, its yield stress decreased with increasing temperature. When the temperature was higher than 120 ℃, the yield peak disappears, showing good plasticity. PMMA was also sensitive to the strain-rate. The strain hardening was gentle when the rate was ranging from 0. 1 s-1 to 0. 001 s-1. The microscopic mechanism above temperature and stress-strain dependent behavior was explained.

关 键 词：聚甲基丙烯酸甲酯 玻璃化转变温度 单轴压缩 力学性能 

分 类 号：TQ325.7[化学工程—合成树脂塑料工业]