Mechanical and thermal analysis of aging in strained polymethyl methacrylate

被引：18
|
作者：
Nanzai, Y [1 ]
Miwa, A [1 ]
Cui, SZ [1 ]
机构：
[1] Osaka City Univ, Dept Mech Engn, Sumiyoshi Ku, Osaka 5588585, Japan
来源：
JSME INTERNATIONAL JOURNAL SERIES A-SOLID MECHANICS AND MATERIAL ENGINEERING | 1999年 / 42卷 / 04期
关键词：
high polymer materials; structural analysis; material testing; stress relaxation; aging; polymethyl methacrylate; yield stress; differential scanning calorimetry; thermally stimulated deformation recovery;
D O I：
10.1299/jsmea.42.479
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
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.
引用
收藏
页码：479 / 484
页数：6
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