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Morphologic and kinetic study of an epoxy-poly(ethyleneoxide) system. The fluorescence to predict miscibility

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Abstract

The kinetic of the curing process in the ethylenediamine (EDA)-poly (bisphenol A-co-epichlorohydrin) glycidyl end-capped (DGEBA) mixture modified with poly(ethylene oxide) (PEO) was studied. The epoxy component was labeled with a fluorescence group (dansyl) treating the DGEBA with the reactive dansyl derivative DNS-EDA. Dynamic DSC experiments were carried out and from their results the effect of the PEO composition on the epoxy curing was discussed. Furthermore, the effect of cure temperature and PEO composition on the morphology and crystallinity of the blend were studied as well. The morphologic study was carried out using complementarily optical transmission (TOM) and epifluorescence (EFM) microscopy. It was observed that: i) the addition of a non-reactive thermoplastic leads to a dilution effect of the reactive groups and therefore a decrease of the epoxy amine reaction rate; ii) the PEO composition does not seem to affect the non catalyzed process of the epoxy curing, while an increase in the PEO fraction within the epoxy/PEO mixture seems to change the mechanism of the cure reaction; iii) dynamic DSC scans, TOM and EFM images and steady state fluorescence spectra of the cured samples suggest that when the curing temperature increases there is an increase in the miscibility between PEO and the epoxy-amine reaction mixture; and iv) a reduction in the PEO/cured epoxy miscibility as the fraction of PEO increases was observed.

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Acknowledgments

The authors wish to acknowledge the Education, Culture and Sports Ministry of Spain and Carlos III University of Madrid for supporting the post-doc study of Dr. J. Gonzalez-Benito in the Departamento de Ciencias y Técnicas Físico Químicas de la U.N.E.D. Furthermore, I would like to thank Professor I. Fernández de Piérola for accepting me to research with her group.

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Authors and Affiliations

  1. Department of Materials Science and Metallurgic Engineering, Universidad Calos III de Madrid. Avda. Universidad 30, 28911, Leganés (Madrid), Spain

    J. Gonzalez-Benito

  2. Departamento de Ciencias y Técnicas Fisico Químicas, Universidad Nacional de Educación a Distancia (U.N.E.D.), PO Senda del Rey s/n, 2840, Madrid, Spain

    I. Esteban

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Correspondence to J. Gonzalez-Benito.

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Gonzalez-Benito, J., Esteban, I. Morphologic and kinetic study of an epoxy-poly(ethyleneoxide) system. The fluorescence to predict miscibility. Colloid Polym Sci 283, 559–569 (2005). https://doi.org/10.1007/s00396-004-1186-0

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  • DOI: https://doi.org/10.1007/s00396-004-1186-0

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