玻璃-聚合物应变硬化中的粘塑性和大尺度链松弛
Viscoplasticity and large-scale chain relaxation in glassy-polymeric strain hardening
摘要：
本文提出了一个解释大尺度链松弛的玻璃态高分子力学响应的简单理论。它捕获了从完美塑性响应到强应变硬化的交叉，因为聚合度$N$增加，而不引起缠结。通过将硬化与单体和链段尺度上的相互作用联系起来，我们正确地预测了它的大小。在应变速率$\dotε$下的主动变形期间，由于需要保持恒定的链轮廓长度而引起的应变激活松弛将特征松弛时间的$N$依赖性降低了因子$\sim \dotεN$。这一预测与最近的实验和模拟结果是一致的，我们建议如何进一步测试实验。
英文摘要：
A simple theory for glassy polymeric mechanical response which accounts for large scale chain relaxation is presented. It captures the crossover from perfect-plastic response to strong strain hardening as the degree of polymerization $N$ increases, without invoking entanglements. By relating hardening to interactions on the scale of monomers and chain segments, we correctly predict its magnitude. Strain activated relaxation arising from the need to maintain constant chain contour length reduces the $N$ dependence of the characteristic relaxation time by a factor $\sim \dotεN$ during active deformation at strain rate $\dotε$. This prediction is consistent with results from recent experiments and simulations, and we suggest how it may be further tested experimentally.
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