Non-isothermal cure and exfoliation of tri-functional epoxy-clay nanocomposites
The non-isothermal cure kinetics of polymer silicate layered nanocomposites based on a tri-functional epoxy resin has been investigated by differential scanning calorimetry. From an analysis of the kinetics as a function of the clay content, it can be concluded that the non-isothermal cure reaction...
| Autores: | , , |
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| Tipo de documento: | artigo |
| Data de publicação: | 2015 |
| País: | España |
| Recursos: | Universitat Politècnica de Catalunya (UPC) |
| Repositório: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglês |
| OAI Identifier: | oai:upcommons.upc.edu:2117/93128 |
| Acesso em linha: | https://hdl.handle.net/2117/93128 https://dx.doi.org/10.3144/expresspolymlett.2015.65 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Nanocomposites (Materials) Epoxy resins Thermosetting composites Nanocomposites Thermosetting resins Thermal properties Exfoliation Epoxy resin Nanocompostos (Materials) Resines epoxídiques Compostos termoenduribles Àrees temàtiques de la UPC::Enginyeria dels materials |
| Resumo: | The non-isothermal cure kinetics of polymer silicate layered nanocomposites based on a tri-functional epoxy resin has been investigated by differential scanning calorimetry. From an analysis of the kinetics as a function of the clay content, it can be concluded that the non-isothermal cure reaction can be considered to consist of four different processes: the reaction of epoxy groups with the diamine curing agent; an intra-gallery homopolymerisation reaction which occurs concurrently with the epoxy-amine reaction; and two extra-gallery homopolymerisation reactions, catalysed by the onium ion of the organically modified clay and by the tertiary amines resulting from the epoxy-amine reaction. The final nanostructure displays a similar quality of exfoliation as that observed for the isothermal cure of the same nanocomposite system. This implies that the intra-gallery reaction, which is responsible for the exfoliation, is not significantly inhibited by the extra-gallery epoxy-amine cross-linking reaction. |
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