ISSN:
0025-116X
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Brief irradiation of an epoxy resin is shown to induce a chemiluminescence emission which decays over a period of minutes. At cure temperatures, the intensity of this emission passes through a minimum with cure time, correlating with the vitrification of the resin. Photo-induced chemiluminescence can also be observed at room temperature in glassy resins. Studies of emission and excitation wavelengths, atmosphere dependence, electric field effects and thermoluminescence from irradiated resin suggest that two phenomena are responsible. For fluid resins curing in air, the emission is due to the recombination of radicals participating in the oxidation of the resin. As the resin vitrifies, the luminescence is increasingly due to recombination of photo-induced electron-cation pairs and is sensitive to the vitrification. This phenomenon could provide a new method for monitoring cure in thermosetting resins.
Additional Material:
7 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/macp.1989.021901225
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