Comparative study of the physical aging of the epoxy systems BADGE n = 0/m‐XDA and BADGE n = 0/m‐XDA/PEI |
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| Authors: | F Fraga P Payo E Rodríguez‐Núñez J M Martínez‐Ageitos C Castro‐Díaz |
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| Affiliation: | 1. Departamento de Física Aplicada, Facultad de Ciencias, Universidad de Santiago de Compostela, Campus Universitario, 27002 Lugo, Spain;2. Departamento de Ingeniería Química, Facultad de Ciencias, Universidad de Santiago de Compostela, Campus Universitario, 27002 Lugo, Spain |
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| Abstract: | The physical aging of the epoxy network consisting of a diglycidyl ether of bisphenol A, m‐xylylenediamine, and polyetherimide was studied by differential scanning calorimetry. The glass transition temperature and the variation of the specific heat capacities have been calculated using the method, based on the intersection of both enthalpy–temperature lines for glassy and liquid states. The apparent activation energy (EH) was calculated using a single method that involved separate temperature and excess enthalpy dependency. All calorimetric data were compared with those obtained for the epoxy network without thermoplastic. thermoplastic. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 103: 3931–3935, 2006 |
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| Keywords: | epoxy‐amine reactions physical aging relaxation enthalpy |
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