Chemistry: analytical and immunological testing – Synthetic or natural resin
Patent
1986-06-25
1988-01-05
Bashore, S. Leon
Chemistry: analytical and immunological testing
Synthetic or natural resin
436 34, 436 56, 436172, 436903, 260 97, 260102, 534588, 534689, G01N 3300, G01N 3344
Patent
active
047176741
ABSTRACT:
A method for determining the extent of polymerization of an epoxy system consisting of adding a fluorescent label, the label having a reactivity similar to the reactivity of the curing agent, to the epoxy system and measuring the fluorescence intensity during polymerization. The fluorescence intensity of the label at its emission maximum increases sharply with polymerization, allowing one to follow cure reactions in a quantitative way by measuring fluorescence, especially in the later stages of cure beyond gelation. The composition, reactivity ratio, activation energy and weight-average molecular weight can also be determined by adding a label, such as p,p'-diaminoazobenzene (DAA) or trans diamine-stilbene (DAS), to mimic the reactivity of the curing agent, such as diaminodiphenyl sulfone (DDS) or methylene dianiline (MDA), and measuring the UV-VIS spectra in addition to the fluorescence intensity. Reaction of the label with the epoxide produces spectrophotometric shifts which are deconvoluted based on the band assignments of model compounds to obtain compositional analyses of cure products.
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Bashore S. Leon
Cody Lori-Ann
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