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Polymers 2018, 10(6), 578; https://doi.org/10.3390/polym10060578

Determination of Pressure Dependence of Polymer Phase Transitions by pVT Analysis

Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Str. 6, 01069 Dresden, Germany
Received: 27 April 2018 / Revised: 16 May 2018 / Accepted: 17 May 2018 / Published: 24 May 2018
(This article belongs to the Special Issue Phase Behavior in Polymers)
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Abstract

Glass transitions, melting, crystallization, and the isotropization of polymers are connected with changes in the density, respectively the specific volume (Vsp), which can be analyzed by dilatometric methods. Here, the pressure dependence of such transitions is determined by pressure volume temperature (pVT) analysis for different thermoplastic polymers in the pressure range of 10 to 200 MPa, and the temperature range from room temperature to 350 °C. The values for ambient pressure are extrapolated. It is shown that polymer transitions always increase with pressure, and that the melting temperature and glass transition temperature are nearly linearly dependent on pressure. This information, as well as the observed density changes with pressure and temperature, is very important for the processing of thermoplastics, including their simulation, as well as for the thermodynamic interpretations of the transition’s nature. View Full-Text
Keywords: pressure volume temperature (pVT) analysis; phase transition; glass transition temperature; melt transition temperature; crystallization temperature; pressure dependence; polyethersulfone; polycarbonate; polycaprolactone pressure volume temperature (pVT) analysis; phase transition; glass transition temperature; melt transition temperature; crystallization temperature; pressure dependence; polyethersulfone; polycarbonate; polycaprolactone
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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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Pionteck, J. Determination of Pressure Dependence of Polymer Phase Transitions by pVT Analysis. Polymers 2018, 10, 578.

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