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Dielectric studies of water in epoxy resins
Author(s) -
Maxwell Ian D.,
Pethrick Richard A.
Publication year - 1983
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.1983.070280719
Subject(s) - diglycidyl ether , epoxy , dielectric , materials science , curing (chemistry) , ether , amorphous solid , conductivity , relaxation (psychology) , composite material , bound water , doping , glass transition , polymer chemistry , chemical engineering , polymer , molecule , organic chemistry , chemistry , bisphenol a , psychology , social psychology , engineering , optoelectronics
Dielectric measurements are reported on amine‐cured epoxy resin samples over a frequency range from 200 Hz to 200 kHz and a temperature range from −60°C to 70°C as a function of molecular weight of the diglycidyl ether and water content. The effects of change of the molecular weight of the diglycidyl ether on the dielectric relaxation are small in comparison with the changes observed on the introduction of water into the matrix. Analysis of the data indicates the presence of cluster—free and bound—molecularly dispersed water. The former are presumed to be found in voids and cavities which arise in curing powder samples. The conductivity of the water‐doped samples reflects the mobility of the water and is compared with the predictions of theories for amorphous materials.