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首页> 外文期刊>JSME International Journal. Series A >Mechanical and Thermal Analysis of Aging in Strained Polymethyl Methacrylate
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Mechanical and Thermal Analysis of Aging in Strained Polymethyl Methacrylate

机译：应变甲基丙烯酸甲酯老化的力学和热分析

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摘要

Aging in quenched and strained polymethyl methacrylate (PMMA) has been studied using a differential scanning calorimetry (DSC) and a thermally stimulated deformation recovery measurement as well as a mechanical compression test. The aging in quenched and strained PMMA was compared with the physical aging in quenched PMMA with no strains. The PMMA samples strained in compression before the aging showed an evolution of yield stress with aging time much faster than that in quenched samples with no strains. The DSC analysis, however, showed that the endothermic peak for the quenched and strain-aged PMMA was less developed than that for the quenched PMMA with no strains. This paradox was analyzed using the deformation recovery data for quenched and strain-aged PMMA. The analysis led us to the conclusion that the evolution of yield stress in quenched and strain-aged PMMA is probably due to the structural change locking the strain energy tightly in the polymeric structure.
机译：已使用差示扫描量热法（DSC）和热刺激变形恢复测量以及机械压缩试验研究了淬火和应变的聚甲基丙烯酸甲酯（PMMA）的老化。将淬火和应变的PMMA中的老化与无应变的淬火PMMA中的物理老化进行了比较。在老化之前受压应变的PMMA样品显示出屈服应力随老化时间的演变要比没有应变的淬火样品快得多。然而，DSC分析表明，与没有应变的淬火的PMMA相比，淬火和应变时效的PMMA的吸热峰不那么发达。使用变形恢复数据对淬火和应变时效的PMMA进行了这一悖论的分析。分析得出的结论是，淬火和应变时效的PMMA中屈服应力的演变可能是由于结构变化将应变能紧密锁定在聚合物结构中。

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