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Flexibility and phase transitions of polymers
Author(s) -
Schneider Hans Adam
Publication year - 2003
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.11834
Subject(s) - polymer , glass transition , crystallization , flexibility (engineering) , materials science , monomer , phase transition , polymer chemistry , chain (unit) , thermodynamics , chemical physics , chemistry , composite material , physics , mathematics , statistics , astronomy
It is shown, that both the mobility of polymers as well their transition temperatures (glass transition and crystallization) depend on the “flexibility” of simple bonds, i.e., on their ability to promote by energetically stimulated rotations conformational changes to release stresses. The polymer class specific interdependence between melting temperature, T m and glass temperature, T g , suggests that the “flexibility” of polymers depends additionally on the probability of interactions between sequences of polymer chains. Interaction between polymer chain sequences controls at the same time the ordering necessary for crystallization. Characteristic of polymers is thus the dependence of both transition temperatures on the “mass/'flexible bond” of the monomeric (repeating) unit, μ/ρ. This experimentally observed polymer class specific behavior is reflecting the similar probabilities of interaction within a given class of polymers. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 1590–1599, 2003