Development of cooperativity in the local segmental dynamics of poly(vinylacetate): synergy of thermodynamics and intermolecular coupling

The properties of the alpha - and Johari-Goldstein beta -relaxations in conjunction with configurational entropy data are used to show how cooperativity of the dynamics of poly(vinylacetate) develops as temperature is decreased towards T sub g from above. Such behavior is also characteristic of smal...

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Bibliographic Details
Published in:Polymer (Guilford) 2002, Vol.43 (2), p.567-573
Main Authors: NGAI, K. L, ROLAND, C. M
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Thermal and thermodynamic properties
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Summary:The properties of the alpha - and Johari-Goldstein beta -relaxations in conjunction with configurational entropy data are used to show how cooperativity of the dynamics of poly(vinylacetate) develops as temperature is decreased towards T sub g from above. Such behavior is also characteristic of small molecule glass-forming liquids, demonstrating that the combined effects of configurational entropy changes and intermolecular coupling underlie structural relaxation phenomena. Any theoretical model must include both thermodynamics and many-body dynamics in order to accurately describe the general properties of the glass transition.
ISSN:0032-3861
1873-2291
DOI:10.1016/s1089-3156(01)00011-3