论文标题
聚合物玻璃的放松时间很大
Relaxation time of a polymer glass stretched at very large strains
论文作者
论文摘要
样品的聚合物松弛动态，延伸至应力硬化状态，在室温下，通过原始的介电光谱设置，在室温下，作为应变$λ$的函数。机械应力改变了介电光谱的形状，主要是因为它影响了主要的聚合物松弛时间$τ$，该介绍取决于$λ$，并且是$ \dotγ$的降低函数。最快的动态不是以产量而是在软化方案中达到。在硬化过程中，动力学会减慢，随着$τ$的逐步增加。介电强度的$ \dotγ$和$λ$的少量影响不得排除。
The polymer relaxation dynamic of a sample, stretched up to the stress hardening regime, is measured, at room temperature, as a function of the strain $λ$ for a wide range of the strain rate $\dotγ$, by an original dielectric spectroscopy set up. The mechanical stress modies the shape of the dielectric spectra mainly because it affects the dominant polymer relaxation time $τ$, which depends on $λ$ and is a decreasing function of $\dotγ$. The fastest dynamics is not reached at yield but in the softening regime. The dynamics slows down during the hardening, with a progressive increase of $τ$. A small inuence of $\dotγ$ and $λ$ on the dielectric strength cannot be excluded.
