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Shear-induced apparent shift of phase boundary of binary polymer blends

机译：剪切诱导的二元聚合物共混物相边界的表观位移

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摘要

The combined influence of the thermodynamical and hydrodynamic effects of shear was tentatively considered for the first time, in the modeling of the shear-induced phase behavior of binary polymer blends in this paper. In this model, the original "two-fluid" model proposed by Onuki([1, 2]) was modified by replacing the quiescent thermodynamical term with the one defined in the frame of extended irreversible thermodynamics (EIT).([3-5]) The stress term of the polymer blend was determined by using the rule of "Double Reptation" ([6,7]) along with the Graessley's([8]) functions to make the model applicable in both linear and weak non-linear regions. Then the apparent shift of phase boundary of a model blend system was computed by using this theory. It's found that this modified theory can predict both the "miscibility gap" and anisotropical phase separation of the polymer blend, while the two different previous theories, that is the pure thermodynamical one and hydrodynamic one, could only predict one but not both of them. For example, this modified "two-fluid" model predicts that the miscibility gap can be observable not only in vorticity direction but also in the velocity gradient direction.
机译：在模拟二元聚合物共混物的剪切诱导相行为时，首次尝试考虑剪切的热力学和流体力学效应的综合影响。在该模型中，由Onuki（[1，2]）提出的原始“双流体”模型通过用扩展不可逆热力学（EIT）框架中定义的静态热力学术语来代替。 ]）聚合物共混物的应力项是通过使用“双重隆起”（[6,7]）规则和Graessley's [[8]）函数确定的，从而使模型可同时适用于线性和弱非线性地区。然后利用该理论计算了模型混合系统的相边界的表观位移。发现该修改后的理论可以预测聚合物共混物的“混溶间隙”和各向异性相分离，而先前的两种不同的理论（即纯热力学理论和流体力学理论）只能预测其中之一，而不能同时预测两者。例如，该修改的“双流体”模型预测，不仅在涡度方向上而且在速度梯度方向上都可以观察到混溶间隙。

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