Applications of near-IR spectroscopy in the investigations of react ions of epoxy compounds with amines.
Part II. Studies on the re action rate of active diluents of epoxide resins with triethylenetetramine
The rate of reaction of epoxy groups in active diluents of epoxide resins with triethylenetetramine has been determined by the method of near-IR spectroscopy on the basis of determination of the degree of conversion of epoxy groups with primary and secondary amino groups. The degree of conversion of epoxy groups has been obtained from the changes in absorbancy In the 4530 cm-1 band, of primary amino groups — in the 4920 cm-1 band, and of secondary amino groups — from the difference in absorbancy of the sum of primary and secondary amino groups at 6490 cm-1 and absorbancy of primary amino groups only. It has been demonstrated that reactivity of the epoxy compounds studied decreases in the series: phenyl glycidyl ether > diglycidyl ether of ethylene glycol > butyl glycidyl ether > glycidyl ester of fatty acids > styrene oxide = vinyl cyclohexene dioxide.
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