INVESTIGADORES
FRONTINI patricia Maria
artículos
Título:
The Class Transition Temperature of Nonstoichiometric Epoxy-Amine Networks
Autor/es:
C.. VALLO; P. M. FRONTINI; R. J. WILLIAMS
Revista:
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
Editorial:
JOHN WILEY & SONS INC
Referencias:
Lugar: New York Vol.; Año: 1991 p. 1503 - 1511
ISSN:
0887-6266
Resumen:
Glass transition temperatures ( T,) of nonstoichiometric epoxy-amine networks based onthe diglycidylether of bisphenol A (DGEBA), are analyzed in terms of the network structure.In most cases reasonable predictions of T, can be made using an empirical equation reportedby L. E. Nielsen together with the experimental Tg value of the stoichiometric networkand statistical calculations of the concentration of elastic chains. It is stated that in theserigid networks the concentration of elastic chains is the main structural factor associatedto the variation of Tg with stoichiometry. For flexible networks based on the diglycidyletherof butanediol (DGEBD) , the effect of elastic chains on the T, value is much less significant.
