论文标题
偏离应力驱动的瞬态熔融在玻璃过渡温度下方的震动聚合物中
Deviatoric Stress Driven Transient Melting Below the Glass Transition Temperature in Shocked Polymers
论文作者
论文摘要
玻璃过渡温度周围和下方的聚合物的放松受一系列相关的单位过程的控制，并具有广泛的时间尺度。冲击载荷的快速变形速率可以抵消这些过程的很大一部分，从而导致橡胶的动态玻璃转变。在这封信中，我们报告了反向，即在冲击载荷下玻璃状聚合物的短暂熔化。冲击锋附近的较大偏斜应力会引起骨架二面角的快速转变，以及聚合物融化的应力松弛特征。其次是玻璃杯预期的放松较慢。
The relaxation of polymers around and below their glass transition temperature is governed by a range of correlated unit processes with a wide range of timescales. The fast deformation rates of shock loading can negate a significant fraction of these processes resulting in the dynamical glass transition in rubbers. In this letter we report the inverse, a transient melting of glassy polymer under shock loading. The large deviatoric stresses near the shock front induce fast transitions in backbone dihedral angles and a stress relaxation characteristic of polymer melts. This is followed by the slower relaxation expected for glasses.
