Thermal analysis of polymer layered silicate nanocomposites. Identification of nanostructure development by DSC
| Autor: | John M. Hutchinson, Fatemeh Shiravand, P. Cortés, Yolanda Calventus, Iria Fraga |
|---|---|
| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament d'Enginyeria Química, Universitat Politècnica de Catalunya. Departament de Màquines i Motors Tèrmics, Universitat Politècnica de Catalunya. TERFIQ - Grup de Termodinàmica i Fisico-Química |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
MECHANISM
Materials science Diglycidyl ether MONTMORILLONITE Layered silicate Differential scanning calorimetry (DSC) EPOXY-CLAY NANOCOMPOSITES Calorimetry STOICHIOMETRY Nanocomposites CURE TEMPERATURE chemistry.chemical_compound Differential scanning calorimetry Cure kinetics Nanocompòsits (Materials) Diamine Epoxy resin Physical and Theoretical Chemistry Composite material Nanocomposites (Materials)--Research Thermal analysis chemistry.chemical_classification EXFOLIATION Nanocomposite Resines epoxídiques Epoxy resins Silicates Epoxy Polymer Condensed Matter Physics Enginyeria dels materials::Materials compostos [Àrees temàtiques de la UPC] Exfoliation joint RESIN chemistry visual_art Calorimetria visual_art.visual_art_medium MORPHOLOGY Silicats Enginyeria química::Química física [Àrees temàtiques de la UPC] |
| Zdroj: | UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) Recercat. Dipósit de la Recerca de Catalunya Universitat Jaume I |
| Popis: | It has been shown, for three different polymer layered silicate (PLS) nanocomposite systems, how differential scanning calorimetry (DSC) can identify the different reactions of homopolymerisation and of crosslinking that occur in the intra- and extra-gallery regions of these nanocomposites, respectively, and hence how DSC can be used to assess the cure conditions for optimising their nanostructure. The PLS nanocomposites are based upon: (i) diglycidyl ether of bisphenol-A (DGEBA) cured with a polyoxypropylene diamine; (ii) DGEBA cured with an -NH2 terminated hyperbranched polymer (HBP); and (iii) tri-glycidyl p-amino phenol (TGAP) cured with a diamine. In each case, the existence of both intra- and extra-gallery reactions in the DSC cure curves, and whether they occur simultaneously or sequentially, and in what order, are identified and correlated with the nanostructure as observed by small angle X-ray scattering and transmission electron microscopy. In particular, it is shown that the intra-gallery reaction must precede the extra-gallery for significant exfoliation to occur. In accordance with this scenario, the TGAP/diamine system displays the greatest degree of exfoliation, the DGEBA/diamine system the least, with the DGEBA/HBP system intermediate. For those systems in which significant exfoliation occurs, the DSC cure curves also allow the optimum cure conditions, such as the isothermal cure temperature, to be determined. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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