Rupture in rapid uniaxial extension of linear entangled melts
Rupture in rapid uniaxial extension of linear entangled melts
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DOI：
10.1007/s00397-010-0491-4
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发表时间：
2010-10
期刊：
影响因子：
2.3
通讯作者：
Yangyang Wang;Shi‐Qing Wang
中科院分区：
文献类型：
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作者：
Yangyang Wang;Shi‐Qing Wang
我们对单分散缠结熔体进行了单轴延伸实验，以说明 Malkin 和 Petrie 定义的玻璃状区域的失效起源（J Rheol 41:1-25, 1997）。发现缠结的熔体经历了超过临界速率的屈服到断裂转变。我们表明，马尔金和皮特里定义的“玻璃状”区域的开始实际上是在橡胶平台的中间，其中缠结熔体的机械响应不受玻璃链动力学的影响。在有限链延伸性的极限下，断裂似乎是通过断链发生的。
We have carried out uniaxial extension experiments on a monodisperse entangled melt to illustrate the origin of failure in the glass-like zone defined by Malkin and Petrie (J Rheol 41:1–25, 1997). The entangled melt was found to undergo a yield-to-rupture transition beyond a critical rate. We show that the onset of the “glass-like” zone defined by Malkin and Petrie is actually in the middle of the rubbery plateau where the mechanical response of entangled melts is not dictated by glassy chain dynamics. The rupture occurs plausibly through chain scission in the limit of finite chain extensibility.