Simultaneous evaluation of viscosity and retardation time in glassy polymers by a parallel‐plate technique
作者:
E. Macho,
A. Alegri´a,
J. Colmenero,
期刊:
Journal of Applied Physics
(AIP Available online 1988)
卷期:
Volume 64,
issue 2
页码: 642-646
ISSN:0021-8979
年代: 1988
DOI:10.1063/1.341954
出版商: AIP
数据来源: AIP
摘要:
In this work we describe a new experimental procedure for parallel‐plate rheometry of glassy polymers above the glass‐transition temperature range. This method has been used with an automated setup built by us which is linked to a HP‐86 desk computer. Both our experimental procedure and experimental setup allow us not only to determine the Newtonian viscosity in the wide 104–109Pa s range, but also the evaluation of a kind of retardation time. This is related to the time that the sample needs to reach the viscous behavior. Moreover, this time can be identified with the retardation time corresponding to the effects of the entanglements in the polymer melt, at least for the two polymers investigated here: polycarbonate and polysulfone.
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