Effect of Aging on the Mechanical Properties of Polymeric Materials
Effect of Aging on the Mechanical Properties of Polymeric Materials
复制标题
老化对高分子材料力学性能的影响
DOI：
10.1080/10601329409350099
复制
发表时间：
1994
期刊：
影响因子：
--
通讯作者：
J. Verdu
中科院分区：
文献类型：
--
作者：
J. Verdu
摘要老化可以在分子、大分子和/或形态水平上改变聚合物的结构，从而引起力学性能的变化。对于非橡胶材料，硬度通常不会改变，但非晶态聚合物中的传质(溶剂增塑或增塑剂损失)或半结晶聚合物中的相转移(结晶或晶体破坏)除外。最显著的模数变化发生在非晶态为橡胶状态的半结晶聚合物的放射化学老化过程中。屈服特性的变化通常与刚度的变化方式相同。T<；Tg下的物理时效会导致屈服应力的显著增加。断裂性能可以观察到非常一般的特征，例如：1)在涉及拉伸试验和相关方法的老化动力学研究中，只有极限伸长率e是一个相关变量；2)对于初始延性材料，给定退化转化率的e变化幅度要大得多。
Abstract Aging can modify polymer structure at the molecular, macromolecular, and/or the morphological level and thus induce changes in the mechanical properties. Stiffness is generally not modified for nonrubbery materials, except for mass transfer (solvent plasticization or plasticizer loss) in amorphous polymers or phase transfer (crystallization or crystal destruction) in semicrystalline polymers. The most significant modulus changes occur in the radiochemical aging of semicrystalline polymers whose amorphous phase is in the rubbery state. Yield properties generally vary in the same way as stiffness. Physical aging at T < T g can lead to a significant increase in the yield stress. Very general features can be observed for rupture properties, for instance: 1) Only ultimate elongation e is a pertinent variable in kinetic studies of aging involving tensile testing and related methods, 2) the amplitude of e variation for a given degradation conversion is considerably higher for initially ductile materials...