Glass transition of polyethylene: Volume relaxation
作者:
G. T. Davis,
R. K. Eby,
期刊:
Journal of Applied Physics
(AIP Available online 1973)
卷期:
Volume 44,
issue 10
页码: 4274-4281
ISSN:0021-8979
年代: 1973
DOI:10.1063/1.1661951
出版商: AIP
数据来源: AIP
摘要:
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 aTgof 231 ± 9 K but the uncertainties preclude any correlation with specific volume over the range 1.01–1.05 cm3g−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.
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