Highly exfoliated nanostructure in trifunctional epoxy/clay nanocomposites using boron trifluoride as initiator
| Autor: | Fatemeh Shiravand, Xavier Fernández-Francos, Yolanda Calventus, John M. Hutchinson, Xavier Ramis |
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| Přispěvatelé: | Química Analítica i Química Orgànica, Universitat Rovira i Virgili., Universitat Politècnica de Catalunya. Departament de Màquines i Motors Tèrmics, Universitat Politècnica de Catalunya. POLTEPO - Polímers Termoestables Epoxídics |
| Rok vydání: | 2014 |
| Předmět: |
Materials science
Polymers and Plastics Diphenyl sulfone Calorimetry Enginyeria dels materials [Àrees temàtiques de la UPC] Nanocomposites chemistry.chemical_compound Differential scanning calorimetry Nanocompòsits (Materials) Polymer chemistry Materials Chemistry Exfoliation Curing (chemistry) Boron trifluoride Montmorillonite Nanocomposites (Materials) Nanocomposite Cationic polymerization General Chemistry Epoxy Surfaces Coatings and Films chemistry Epoxy Resin visual_art Calorimetria visual_art.visual_art_medium Differential Scanning Calorimetry (DSC) |
| Zdroj: | Journal of Applied Polymer Science Repositori Institucional de la Universitat Rovira i Virgili Consejo Superior de Investigaciones Científicas (CSIC) UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
| DOI: | 10.1002/app.40020/full |
| Popis: | Epoxy/clay nanocomposites based upon a trifunctional epoxy resin, triglycidyl p-amino phenol (TGAP), have been prepared by intercalating an initiator of cationic homopolymerization, a boron trifluoride monoethylamine (BF3·MEA) complex, into the montmorillonite clay galleries before the addition of the TGAP and the curing agent, 4,4-diamino diphenyl sulfone (DDS), and effecting the isothermal curing reaction. The BF3·MEA enhances the intragallery cationic homopolymerization reaction, which occurs before the extragallery cross-linking reaction of the TGAP with the DDS, and which hence contributes positively to the mechanism of exfoliation of the clay. The effects of isothermal cure temperature and of BF3·MEA content have been studied, in respect of both the reaction kinetics, monitored by differential scanning calorimetry, and the nanostructure, as identified by small-angle X-ray scattering and transmission electron microscopy. It is shown that the use of BF3·MEA in this way as an initiator of intragallery homopolymerization significantly improves the degree of exfoliation in the cured nanocomposites. The authors are grateful to Huntsman Corporation for the epoxy resin and curing agent. This work was supported financially by MINECO Project MAT2011-27039-C03 and the Generalitat de Catalunya (2009-SGR-1512). FS is grateful for a grant from the Agència de Gestió d'Ajuts Universitaris i de Recerca (AGAUR), FI-DGR 2011 and XF-F acknowledges the contract JCI-2010-06187. |
| Databáze: | OpenAIRE |
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