| PMMA在玻璃化温度以上单轴压缩力学性能研究 |
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| 引用本文： | 冯维娜,张响,张勤星,王市伟,孙冰丽,李倩.PMMA在玻璃化温度以上单轴压缩力学性能研究[J].中国塑料,2013,27(11):66-70. |
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| 作者姓名： | 冯维娜 张响 张勤星 王市伟 孙冰丽 李倩 |
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| 作者单位： | 1. 郑州大学2. 郑州大学橡塑模具国家工程研究中心3. 郑州大学微纳成型技术国际联合研究中心 |
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| 基金项目： | 国家重点基础研究发展计划（973计划）资助，项目编号2012CB626809 |
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| 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0.001~0.1 s-1应变率范围内，随着应变率提高应变硬化加强。
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| 收稿时间： | 2013-06-09 |
Mechanical Behavior of PMMA Above the Glass Transition Temperature Under Uniaxial Compression |
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| Abstract: | 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. |
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