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Kinetic analysis of relaxation process for the epoxy network diglycidyl ether of bisphenol A/ m ‐xylylenediamine
Author(s) -
Fraga F.,
CastroDíaz C.,
RodríguezNúñez E.,
MartínezAgeitos J. M.
Publication year - 2005
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.21602
Subject(s) - diglycidyl ether , relaxation (psychology) , epoxy , activation energy , bisphenol a , thermodynamics , kinetic energy , materials science , polymer chemistry , glass transition , kinetics , ether , chemistry , polymer , composite material , organic chemistry , physics , psychology , social psychology , quantum mechanics
The relaxation kinetic of the epoxy network diglycidyl ether of bisphenol A (BADGE n = 0) and m ‐xylylenediamine ( m ‐XDA) was analyzed from DSC experimental data, using different theoretical models. Based on a Petrie model, which involved separate contributions of temperature and structure, three characteristic parameters were calculated: a preexponential factor A , an apparent activation energy E H , and a parameter C , which indicate the dependency of relaxation time on structure. This model allowed us to calculate the relaxation function at different ageing temperatures. Another method used to study a relaxation kinetic was the Kovacs–Hutchinson model, which takes into account the dependency of the relaxation time on temperature and structure. The last model used was a two‐parameter equation from Williams–Watts, where the relaxation time is independent of temperature. Using data of characteristic times a master curve for the relaxation function was obtained. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 96: 1591–1595, 2005