Article
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Correlating the Segmental-Relaxation Time of Polystyrene
Version 1
: Received: 1 July 2024 / Approved: 2 July 2024 / Online: 2 July 2024 (11:05:00 CEST)
How to cite: Hieber, C. A. Correlating the Segmental-Relaxation Time of Polystyrene. Preprints 2024, 2024070223. https://doi.org/10.20944/preprints202407.0223.v1 Hieber, C. A. Correlating the Segmental-Relaxation Time of Polystyrene. Preprints 2024, 2024070223. https://doi.org/10.20944/preprints202407.0223.v1
Abstract
A previous related paper dealing with the density relaxation of polystyrene (PS) has shown that the equilibrium relaxation time (eq) has a purely exponential temperature dependence (ETD) below ≈ 100ºC. Such an ETD is now also confirmed based upon available dielectric-spectra data for PS. By combining the ETD behavior of eq (or aT) at low temperatures with a VFTH behavior at higher temperatures (based mainly on available recoverable-shear-compliance data), a composite correlation for eq (or aT) is developed which is continuous with continuous slope at a crossover temperature which is found to be 99.22ºC, where eq = 92.15 sec. This composite representation is shown to describe (without any adjustable parameters) available independent data for the segmental-relaxation time over a finite range both above and below Tcrossover (i.e. the glass-transition temperature).
Keywords
equilibrium relaxation time; glass-rubber transition; glass-transition temperature; polystyrene; segmental-relaxation time; VFTH model
Subject
Physical Sciences, Other
Copyright: 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.
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