An investigation of the yield and postyield behavior and corresponding structure of poly(methyl methacrylate)
An investigation of the yield and postyield behavior and corresponding structure of poly(methyl methacrylate)
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DOI：
10.1002/polb.1993.090310207
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发表时间：
1993-02
期刊：
影响因子：
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通讯作者：
O. A. Hasan;M. Boyce;X. S. Li;S. Berko
中科院分区：
文献类型：
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作者：
O. A. Hasan;M. Boyce;X. S. Li;S. Berko
研究了物理老化对玻璃化聚合物的屈服和后场行为以及相应的结构状态演变的影响。对不同热历史的聚甲基丙烯酸甲酯样品进行了单轴、等温、恒应变率的系统实验，并进行了正电子湮没寿命测量。力学试验结果表明，时效既增加了初始屈服应力，又增加了屈服后发生的应变软化量。
The effects of physical aging on the yield and postyield behavior and corresponding evolution in the structural state of glassy polymers are investigated. A systemetic program of uniaxial, isothermal, constant strain-rate rests on poly(methyl methacrylate) specimens of different thermal histories was carried out and positron annihilation lifetime measurements were performed. The results of the mechanical tests show that aging acts to increase both the initial yield stress and the amount of strain softening which occurs subsequently to yield.