Epoxy/poly(4-vinylphenol)blends crosslinked by imidazole initiation |
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Authors: | Silvia G. Prolongo G. Prolongo |
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Affiliation: | (1) Dpt. Ciencia e Ingeniería de Materiales, ESCET, Universidad Rey Juan Carlos, Madrid, Spain;(2) Dpt. Materiales y Producción Aeroespacial, E. T. S. I. Aeronáuticos, Universidad Politécnica de Madrid, Madrid, Spain |
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Abstract: | Poly(4-vinylphenol) (PVPh) was used as thermoplastic modifier of epoxy resins. Binary epoxy/PVPh mixtures with high thermoplastic content rise high glass transition temperatures (T g) after heating, due to the epoxy-phenol reaction. Blends with low PVPh percentages reach high T g if 2-methylimidazole is added, which catalyses epoxy homopolymerisation and epoxy-phenol reaction. The cured blends do not present phase separation although the network structure depends on the epoxy/phenol ratio. At low PVPh percentage the main crosslinking reaction is epoxy-epoxy but, when the thermoplastic content increases, the epoxy-phenol reaction prevails, causing an important T g increase and becoming less brittle. |
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Keywords: | curing epoxy blend imidazole poly(4-vinylphenol) |
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