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Water in epoxy resins Part II. Diffusion mechanism
Author(s) -
Wong T. C.,
Broutman L. J.
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.760250904
Subject(s) - epoxy , diffusion , materials science , sorption , fick's laws of diffusion , polymer , thermodynamics , glass transition , molecule , effective diffusion coefficient , chemical engineering , polymer chemistry , composite material , chemistry , organic chemistry , physics , adsorption , engineering , medicine , radiology , magnetic resonance imaging
A model is proposed for the diffusion mechanism of water in glassy epoxy resins. The polymer network is assumed to consist of two regions in which water molecules possess different mobilities. By considering the distribution of water molecules among these regions it is possible to describe the concentration dependency of the diffusion coefficient in the sorption and resorption processes. The diffusion coefficient becomes constant when the sorption temperature is close to the effective glass transition temperature of the epoxy‐water binary mixture. An explanation of this effect is also provided by the model.