摘要
基于高聚物长时标力学行为的研究［１～３］所推导出的高聚物的蠕变柔量与推迟时间系数（β）、特征时间（ｔ０）之间的定量关系式和导出的ｔ０与应力（σ）的关系式，分析了ＰＶＣ和ＰＰ试样在不同应力下蠕变测试数据，得到了推迟时间系数（β），特征时间（ｔ０）和ｔ０与σ的依赖性，提出了从不同应力水平蠕变测试预测聚聚物长时标尺寸稳定性和长时标使用寿命的方法．具有重要的学术意义和实用价值．
In this paper a diversal creep function was derived theoretically by the combination or the kinetics of aging in free and creep state. It is successful in relating the compliance D/Do the aging time ta, the ratio of relaxation times in free and creep state (τl/τia ), thecoefficient of retardation time(β) and the creep time (t). Based on the relation the effect ofthe different stress level on the dimensional stability and life time of polypropylene and polyvinyl chloride was studied. The dimensional stability and the life time for pp and PVC were determined by the proposecd method. It is found that the dimensional stability and the life bine of PP and PVC increase with dicreasing the stress.
基金
国家自然科学基金
关键词
高聚物
蠕变
稳定性
使用寿命
tensile creep
long-term mechanical behavior
dimensional stability
