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- W4313441862 abstract "Cure characteristics of epoxy in the epoxy/fiber interphase in composites can be studied using an evanescent wave fluorescence technique. This paper describes the methodology and instrumentation which allows in situ monitoring of epoxy reactions at the interface. The reaction of a stoichiometric mixture of diepoxide, diglycidyl ether of bisphenol-A (DGEBA), and the curing agent 4,4′-diaminodiphenyl sulfone (DDS) is followed by measuring the fluorescence intensity change of the externally added reactive dye, diaminoazobenzene (DAA), as it is converted from a primary amine to a tertiary amine state during cure. By using a sapphire optical fiber as an evanescent wave probe, the fluorescence intensity can be measured within an approximately 150 nm thin layer of epoxy at the fiber surface. A high refractive index value and the good UV-visible transmission character of the sapphire make it the only fiber acceptable as an evanescent probe for DGEBA/DDS epoxy. A number of optical innovations are introduced to maximize the evanescent wave intensity, which include a polymer cladding for the sapphire fiber and metallization of the fiber tip. Cure reaction in the interphase region is compared with that of bulk epoxy." @default.
- W4313441862 created "2023-01-06" @default.
- W4313441862 creator A5053490143 @default.
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- W4313441862 date "2023-01-03" @default.
- W4313441862 modified "2023-09-27" @default.
- W4313441862 title "Reaction monitoring in the epoxy/fiber interphase using evanescent wave fluorimetry — instrumentation and methods" @default.
- W4313441862 doi "https://doi.org/10.1201/9780429070297-26" @default.
- W4313441862 hasPublicationYear "2023" @default.
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