The effects of stoichiometry and structure on the dynamic torsional properties of a cured epoxy resin system
作者:
V.B. Gupta,
L.T. Drzal,
C.Y-C. Lee,
M.J. Rich,
期刊:
Journal of Macromolecular Science, Part B
(Taylor Available online 1984)
卷期:
Volume 23,
issue 4-6
页码: 435-466
ISSN:0022-2348
年代: 1984
DOI:10.1080/00222348408219470
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The dynamic torsional characteristics of a difunctional, bisphenol-A-type epoxy resin cured with different amounts of metaphenylene diamine, using two cure cycles, were determined in torsion at four frequencies between −150° and 200°C. Besides two prominent relaxations, α and β, a third broad, but not very intense, relaxation has been shown to be present in all samples in the intermediate temperature range and has been designated the α transition. An analysis of the data on the temperature and frequency dependence of these relaxations allows some insight into their possible molecular origins. The torsional moduli were found to be related to the molecular packing, as reflected in their densities.
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