Real time dielectric investigations of phase separation and cure in rubber modified epoxy resin systems

Real time dielectric and rheological measurements are reported for mixtures of carboxyl-terminated butadiene acrylonitrile in epoxy resins obtained by curing either with diaminodiphelmethane at 80° or triethylenetetramine at 30° with the diglycidylether of bisphenol-A. A good correlation is observed...

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Bibliographic Details
Published in:European polymer journal 1992-05, Vol.28 (5), p.505-512
Main Authors: Delides, Costas G., Hayward, David, Pethrick, Richard A., Vatalis, Argyris S.
Format: Article
Language:English
Subjects:
Applied sciences
Chemical properties
Exact sciences and technology
Polymer industry, paints, wood
Properties and testing
Technology of polymers
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Summary:Real time dielectric and rheological measurements are reported for mixtures of carboxyl-terminated butadiene acrylonitrile in epoxy resins obtained by curing either with diaminodiphelmethane at 80° or triethylenetetramine at 30° with the diglycidylether of bisphenol-A. A good correlation is observed between the time required for gelation determined by the two methods. The mixture is initially homogeneous but soon undergoes phase separation. The occurrence of phase separation is marked by the appearance of a new dielectric feature which is ascribed to the motion of ionic charges in the conducting occluded rubbery phase. This is the first time that the dielectric technique has been used as a real time monitor of phase separation processes.
ISSN:0014-3057
1873-1945
DOI:10.1016/0014-3057(92)90125-L