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Polymers 2018, 10(1), 38; https://doi.org/10.3390/polym10010038

Calculation of the Contact Angle of Polymer Melts on Tool Surfaces from Viscosity Parameters

1
Department of Materials Technology, School of Engineering, University of Applied Sciences Upper Austria, 4600 Wels, Austria
2
Department Polymer Engineering and Science, Chair of Polymer Processing, Montanuniversitaet Leoben, 8700 Leoben, Austria
*
Author to whom correspondence should be addressed.
Received: 18 October 2017 / Revised: 21 December 2017 / Accepted: 22 December 2017 / Published: 30 December 2017
(This article belongs to the Special Issue Polymers and Block Copolymers at Interfaces and Surfaces)
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Abstract

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. View Full-Text
Keywords: polypropylene; polymethylmethacrylate; contact angle; viscosity; tool surface; wetting; injection molding; extrusion. polypropylene; polymethylmethacrylate; contact angle; viscosity; tool surface; wetting; injection molding; extrusion.
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Zitzenbacher, G.; Dirnberger, H.; Längauer, M.; Holzer, C. Calculation of the Contact Angle of Polymer Melts on Tool Surfaces from Viscosity Parameters. Polymers 2018, 10, 38.

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