Glass transition of polyethylene: Volume relaxation
- 1 October 1973
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 44 (10) , 4274-4281
- https://doi.org/10.1063/1.1661951
Abstract
Data are presented to show that when linear polyethylene is quenched from room temperature to temperatures below 273 K, it exhibits a volume decrease for times long compared with that required to establish temperature equilibrium. The time, temperature, and density dependence of this decrease is shown to be consistent with a relaxation occurring in the amorphous portion (lamella boundary layers) of the samples. The data can be superposed and the shift factors follow the WLF formalism. Analysis by this method yields a Tg of 231 ± 9 K but the uncertainties preclude any correlation with specific volume over the range 1.01–1.05 cm3 g−1. The data indicate the absence of any comparably strong time dependence of the volume near 150 K. This method of detecting a glass transition in partially crystalline polymers is relatively freer of subjective judgment than most.This publication has 53 references indexed in Scilit:
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