Aging of a low molecular weight poly(methyl methacrylate)
Dielectric relaxation of a low molecular weight PMMA was measured in both the equilibrium and glassy states. The intense β process, due to motion of the pendant ester moiety, exhibits a change in T-dependence of both its relaxation time and dielectric strength at T g , reflecting the coupling of thi...
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Published in | Journal of non-crystalline solids Vol. 357; no. 2; pp. 282 - 285 |
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Main Authors | , |
Format | Journal Article Conference Proceeding |
Language | English |
Published |
Oxford
Elsevier B.V
15.01.2011
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | Dielectric relaxation of a low molecular weight PMMA was measured in both the equilibrium and glassy states. The intense
β process, due to motion of the pendant ester moiety, exhibits a change in
T-dependence of both its relaxation time and dielectric strength at
T
g
, reflecting the coupling of this high frequency process to the backbone conformational changes underlying the
α dynamics. Consequently, we can exploit the change in the properties of the
β process during physical aging to quantify the
α relaxation time and its
T-dependence for glassy PMMA. The obtained values,
τ
α
>
10
4, are too long for direct measurement. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 0022-3093 1873-4812 |
DOI: | 10.1016/j.jnoncrysol.2010.07.048 |