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Open AccessArticle

Continuous Two-Domain Equations of State for the Description of the Pressure-Specific Volume-Temperature Behavior of Polymers

1
College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
2
Institute for Plastics Processing (IKV), RWTH Aachen University, Aachen 52074, Germany
*
Author to whom correspondence should be addressed.
Polymers 2020, 12(2), 409; https://doi.org/10.3390/polym12020409 (registering DOI)
Received: 3 January 2020 / Revised: 29 January 2020 / Accepted: 2 February 2020 / Published: 11 February 2020
(This article belongs to the Section Polymer Theory and Simulation)
The two-domain Schmidt equation of state (EoS), which describes the pressure-specific volume–temperature (pvT) behavior of polymers in both the equilibrium molten/liquid state and non-equilibrium solid/glassy state, is often used in the simulation of polymer processing. However, this empirical model has a discontinuity problem and low fitting accuracy. This work derived a continuous two-domain pvT model with higher fitting accuracy compared with the Schmidt model. The cooling rate as an obvious influencing factor on the pvT behavior of polymers was also considered in the model. The interaction parameters of the equations were fitted with the experimental pvT data of an amorphous polymer, acrylonitrile-butadiene-styrene (ABS), and a semi-crystalline polymer, polypropylene (PP). The fitted results by the continuous two-domain EoS were in good agreement with the experimental data. The average absolute percentage deviations were 0.1% and 0.16% for the amorphous and semi-crystalline polymers, respectively. As a result, the present work provided a simple and useful model for the prediction of the specific volume of polymers as a function of temperature, pressure, and cooling rate. View Full-Text
Keywords: pvT; specific volume; polymer; equation of state; injection molding pvT; specific volume; polymer; equation of state; injection molding
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MDPI and ACS Style

Wang, J.; Hopmann, C.; Röbig, M.; Hohlweck, T.; Kahve, C.; Alms, J. Continuous Two-Domain Equations of State for the Description of the Pressure-Specific Volume-Temperature Behavior of Polymers. Polymers 2020, 12, 409.

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