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首页> 外文期刊>Journal of Applied Polymer Science >Modified rheological model of viscosities for BR-SBS blends
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Modified rheological model of viscosities for BR-SBS blends

机译：BR-SBS共混物的粘度改进流变模型

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Blends of polybutadiene (BR) and styrene-butadiene-styrene triblock copolymer (SBS) have been prepared by a two-roll mill. The morphologies of extruded samples from a capillary rheometer were observed by scanning electron microscopy (SEM). It is found that PS phase is dispersed in the BR phase. The glass transition temperature (Tg) of the blend has been examined by using differential scanning calorimetry (DSC). From the Tg behavior and the electron microscopy study, it is found that certain degree of miscibility between the polystyrene phase and the BR phase is observed. The rheological behavior of the blend has been investigated by a capillary rheometer. It is found that the viscosity of the blend increases with increased content of PS phase. The behavior is in accord with the expected behavior of filler effect. To predict the filler effect of PS phase on the BR-SBS blend, a modified model of Chen and Cheng is proposed to elucidate the rheological properties of the BR-SBS blends with different compositions. Chen and Cheng's micromechanical model derived in Part I of this series, which relates the macroscopic shear stress to the macroscopic shear rate of a rigid non-Newtonian suspension when the direct contribution of Brownian force is completely neglected. The agreement between the theoretical predictions and the experimental results is satisfactory.
机译：聚丁二烯（BR）和苯乙烯-丁二烯-苯乙烯三嵌段共聚物（SBS）的共混物已通过两辊磨制备。通过扫描电子显微镜（SEM）观察从毛细管流变仪挤出的样品的形态。发现PS相分散在BR相中。已经通过使用差示扫描量热法（DSC）检查了共混物的玻璃化转变温度（Tg）。从Tg行为和电子显微镜研究，发现在聚苯乙烯相和BR相之间存在一定程度的混溶性。共混物的流变行为已通过毛细管流变仪进行了研究。发现共混物的粘度随着PS相含量的增加而增加。该行为与填充效果的预期行为一致。为了预测PS相对BR-SBS共混物的填充效果，提出了Chen和Cheng的改进模型，以阐明不同组成的BR-SBS共混物的流变性能。 Chen和Cheng的微力学模型在本系列的第一部分中得出，该模型将完全忽略布朗力的直接作用时的宏观剪切应力与刚性非牛顿悬架的宏观剪切速率相关。理论预测与实验结果吻合良好。

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