Universal Scaling Behavior in Startup Shear of Entangled Linear Polymer Melts
Universal Scaling Behavior in Startup Shear of Entangled Linear Polymer Melts
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DOI：
10.1122/1.3086872
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发表时间：
2009-04
影响因子：
3.3
通讯作者：
P. Boukany;Shi‐Qing Wang;Xiaorong Wang
中科院分区：
文献类型：
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作者：
P. Boukany;Shi‐Qing Wang;Xiaorong Wang
我们研究了四种单分散聚合物熔体在启动剪切时的应力超调行为，其链缠结的范围从Z=24到每链160个缠结点。在由γτR>1定义的弹性变形区（其中τR为Rouse松弛时间）中，(i)峰值剪切应力σmax随峰值时间tmax的- 1/2次方而变化，而粘弹性区（对于γτR<1）的指数为- 1/4次方；(ii) σmax随应力峰值γmax的经过应变呈线性变化，其随施加剪切速率γ1/3的变化而变化。（iii）在所有四种丁苯橡胶样品的剪切速率下，超主曲线使随时间变化的剪切应力增长曲线崩溃，直至应力最大值。
We have studied stress overshoot behavior in startup shear of four monodisperse polymer melts with a range of chain entanglement from Z=24 to 160 entanglement points per chain. In the elastic deformation regime defined by γτR>1, where τR is the Rouse relaxation time, (i) the peak shear stress σmax scales with the time tmax at the peak to −1/2 power, in contrast to an exponent of −1/4 in the viscoelastic regime (for γτR<1), (ii) σmax changes linearly with the elapsed strain at the stress peak γmax, which scales with the applied shear rate as γ1/3, (iii) a supermaster curve collapses time-dependent shear stress growth curves up to the stress maximum at all shear rates for all the four styrene-butadiene rubber samples.