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首页> 外文期刊>Journal of Applied Polymer Science >Evaluation of typical rheological models fitting for polycarbonate squeeze flow
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Evaluation of typical rheological models fitting for polycarbonate squeeze flow

机译：适用于聚碳酸酯挤压流的典型流变模型的评估

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High viscous polycarbonate melt exhibits some special rheological characters different from generalized Newtonian fluid during squeezing. It is necessary to evaluate whether the typical rheological models are suitable for polycarbonate squeeze. To avoid the difficult of measuring the inner melt rheological behavior directly, this study presents a method of measuring the compressing force applied on the upper disc of the rheometer to reveal the melt rheology indirectly. The finite difference method (FDM) was employed to discretize the governing equations and constitutive equations established on cylinder coordinate system and to simulate the compressing force. The experiments were carried out under four temperatures and three compressing velocities to test the validations of Leonov, Phan-Thien-Tanner (PTT), eXtended Pom-Pom (XPP), and Cross Williams-Landel-Ferry (Cross-WLF) models. The experimental results show the unique character of compressing force evolution as steepsteadysteepsteady' pattern. Comparison between experiments and simulations reveals that both viscoelastic and viscous models can predict the two steady regions correctly, but only viscoelastic models can simulate the steep increase and decrease of the compressing force. Among the evaluated viscoelastic models, XPP is the most suitable to describe polycarbonate melt compression flow. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42279.
机译：高粘性聚碳酸酯熔体在挤压过程中表现出一些不同于一般牛顿流体的特殊流变特性。有必要评估典型的流变模型是否适合聚碳酸酯挤压。为了避免直接测量内部熔体流变行为的困难，本研究提出了一种测量施加在流变仪上盘上的压缩力的方法，以间接显示熔体流变学。采用有限差分法（FDM）离散化建立在圆柱坐标系上的控制方程和本构方程，并模拟压缩力。实验在四个温度和三个压缩速度下进行，以测试Leonov，Phan-Thien-Tanner（PTT），扩展的Pom-Pom（XPP）和Cross Williams-Landel-Ferry（Cross-WLF）模型的有效性。实验结果表明，压缩力演化的独特特征为“陡峭-陡峭-陡峭-稳定”模式。实验和仿真结果的比较表明，粘弹性模型和粘滞模型都可以正确预测两个稳定区域，但是只有粘弹性模型可以模拟压缩力的急剧增加和减少。在评估的粘弹性模型中，XPP最适合描述聚碳酸酯熔体的压缩流动。 （c）2015 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，42279。

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