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Investigation of cure in epoxy resins: Ultrasonic and thermally stimulated current measurements
Author(s) -
Bunton Lesley G.,
Daly John H.,
Maxwell Ian D.,
Pethrick Richard A.
Publication year - 1982
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.1982.070271119
Subject(s) - epoxy , materials science , composite material , ultrasonic sensor , conductivity , space charge , acoustics , chemistry , electron , physics , quantum mechanics
Acoustic and thermally stimulated current measurements are reported as a function of cure for dicyanodiamide cured epoxy resins. It is found that the acoustic propagation is dominated by the generation of voids and does not directly reflect the extent of cure. In contrast, the thermally stimulated data correlate well with conductivity data, the amplitude of the space charge peak decreasing with increasing degree of cure and the dipole peak shifting to high temperatures as predicted from DSC data. Both methods exhibit potential as NDT methods for cure in resins.