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Diffusion of water in glassy epoxide prepolymers
Author(s) -
GarciaFierro J. L.,
Aleman J. V.
Publication year - 1985
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760250707
Subject(s) - diffusion , epoxide , activation energy , sorption , materials science , fick's laws of diffusion , relaxation (psychology) , thermodynamics , water vapor , kinetics , chemical engineering , analytical chemistry (journal) , chemistry , organic chemistry , catalysis , adsorption , psychology , social psychology , physics , engineering , quantum mechanics
Sorption isotherms show that epoxide prepolymers sorb water in increasing amounts as the temperature decreases and the water vapor concentration increases. Below T g the behavior is typical of a Fickian transport combined with a relaxation process. Diffusion coefficients as function of sorption rates provide temperature shift factors from which the activation energy for diffusion is 35.3 KJ/mol. Combined effect of temperature and water concentration is described by a second order polynomial.
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