Water absorption in epoxy resins by electronic energy transfert

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Water absorption of an epoxy resin was studied by steady-state fluorescence spectroscopy and gravimetry. It was found that the intrinsic emission of the epoxy resin could be modified selecting an adequate excitation wavelength. The epoxy component of the resin was labelled with a trans-4-nitro-4′-aminostilbene fluorescent probe. Using an excitation wavelength of 340 nm it was possible to induce energy transfer to the suitable acceptor trans-4-nitro-4′-dialkylaminostilbene (NDAS). The relative fluorescence intensity /₄₃₃/ /₅₉₆ was used as a convenient means to follow the quenching effect of water on the emission of NDAS when excited via energy transfer. It was found that both the relative intensity and the water content increase linearly with the square root of diffusion time in the early stages of the process. The apparent Stern–Volmer constants for the quenching of the fluorophore, when excited directly in a fluid THF solution or in the polymer matrix, were very similar but lower than when the fluorophore was excited via energy transfer. It was concluded that, at least in the early stages of the water diffusion process, the interchromophoric distance should increase.
Presentación de Póster: Sesión C: Paper presentado en el Congreso "Polymers in the Third Millenium", 2-6 de septiembre de 2001 en Montpellier (Francia).
Poster presentation: Session C: Paper presented at the Polymers in the Third Millennium Conference, 2–6 September, 2001, Montpellier, France
Epoxy resins, Non-radiative energy transfer, Water absorption
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Martin, O., Pastoriza, A., Mikes, F., & Baselga, J. (2002). Water absorption in epoxy resins by electronic energy transfert. Polymer International, Special Issue: Polymers in the Third Millennium, 51 (11), pp. 1207–1210.