About this Materials Science article
Cooperative Molecular Dynamics and Strong/fragile Behavior of Polymers by Christo Alexandrov Solunov is a Materials Science article available to read on EtoBox.
The temperature dependence of the average relaxation time in the glass transition region is discussed. The relations for the number of the basic molecular kinetic units and the number of con®gurations in the cooperative rearranging region are described. The basic molecular kinetic units in the polymers are identi®ed as fragments of the monomeric segments, called beads by Wunderlich. A model of the cooperative unit with the internal rearrangement is supported by the experimental results. Proportionality between the glass transition temperature and the activation energy of the cooperative unit is observed. A correlation is found between the fragility in the relaxation behavior of the supecooled liquids and the temperature dependence of the size of the cooperative region. The strength parameter is related to the strength of resistivity of a basic molecular kinetic unit against its involving in the cooperative rearrangement.
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- Author
- Christo Alexandrov Solunov
- Publisher
- Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0014-3057)
- Published
- 1999
- Language
- EN
- Field
- Materials Science (Physical Sciences)