Calculation of the Contact Angle of Polymer Melts on Tool Surfaces from Viscosity Parameters
Calculation of the Contact Angle of Polymer Melts on Tool Surfaces from Viscosity Parameters
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DOI：
10.3390/polym10010038
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发表时间：
2017-12
期刊：
影响因子：
5
通讯作者：
G. Zitzenbacher;H. Dirnberger;M. Längauer;C. Holzer
中科院分区：
文献类型：
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作者：
G. Zitzenbacher;H. Dirnberger;M. Längauer;C. Holzer
粘度是否以及如何影响刀具表面的润湿性对聚合物加工具有重要意义。本文证明了熔融聚合物的接触角与零剪切粘度之间存在明显的关系。采用固滴法在高温室中研究了熔融聚丙烯和聚甲基丙烯酸甲酯在抛光钢表面的接触角。采用带狭缝模的高压毛细管流变仪测定了低剪切速率范围内的剪切粘度曲线。得到了接触角与零剪切粘度之间的线性关系。此外，将不同聚合物的接触角和零剪切粘度值组合为一个函数。结果表明，对于熔融聚合物对工具表面的润湿，较低的粘度是有利的。此外，提出了一个基于温度变化概念的模型，该模型可以直接从剪切粘度数据计算不同温度下熔融聚合物在钢上的接触角。
It is of great importance for polymer processing whether and how viscosity influences the wettability of tool surfaces. We demonstrate the existence of a distinct relationship between the contact angle of molten polymers and zero shear viscosity in this paper. The contact angle of molten polypropylene and polymethylmethacrylate on polished steel was studied in a high temperature chamber using the sessile drop method. A high pressure capillary rheometer with a slit die was employed to determine the shear viscosity curves in a low shear rate range. A linear relation between the contact angle and zero shear viscosity was obtained. Furthermore, the contact angle and the zero shear viscosity values of the different polymers were combined to one function. It is revealed that, for the wetting of tool surfaces by molten polymers, a lower viscosity is advantageous. Furthermore, a model based on the temperature shift concept is proposed which allows the calculation of the contact angle of molten polymers on steel for different temperatures directly from shear viscosity data.