Identification of nanostructural development in epoxy polymer layered silicate nanocomposites from the interpretation of differential scanning calorimetry and dielectric spectroscopy
| العنوان: | Identification of nanostructural development in epoxy polymer layered silicate nanocomposites from the interpretation of differential scanning calorimetry and dielectric spectroscopy |
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| المؤلفون: | Frida Román, P. Colomer, John M. Hutchinson, Yolanda Calventus |
| المساهمون: | Universitat Politècnica de Catalunya. Departament de Màquines i Motors Tèrmics, Universitat Politècnica de Catalunya. TERFIQ - Grup de Termodinàmica i Fisico-Química |
| المصدر: | UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) Recercat. Dipósit de la Recerca de Catalunya instname |
| سنة النشر: | 2012 |
| مصطلحات موضوعية: | chemistry.chemical_classification, Dielectric spectroscopy, Materials science, Nanocomposite, Física::Termodinàmica [Àrees temàtiques de la UPC], Polymer, Epoxy, Condensed Matter Physics, Exfoliation joint, Nanocomposites, Devitrification, Differential scanning calorimetry, chemistry, visual_art, visual_art.visual_art_medium, Physical and Theoretical Chemistry, Composite material, Glass transition, Instrumentation, Espectroscòpia d'impedància electroquímica |
| الوصف: | The effect of nanoclay on the non-isothermal cure kinetics of polymer layered silicate nanocomposites based upon epoxy resin is studied by calorimetric techniques (DSC and TGA) and by dielectric relaxation spectroscopy (DRS) in non-isothermal cure at constant heating rate. The cure process takes place by homopolymerisation, initiated anionically using 3 wt% dimethylaminopyridine (DMAP), and the influence of the nanoclay content has been analysed. Interesting differences are observed between the nanocomposites with 2 wt% and 5 wt% clay content. At low heating rates, these samples vitrify and then devitrify during the cure. For the sample with 2 wt% clay, the devitrification is accompanied by a thermally initiated homopolymerisation, which can be identified by DRS but not by DSC. The effect of this is to improve the exfoliation of the nanocomposite with 2 wt% clay, as verified by transmission electron microscopy, with a corresponding increase in the glass transition temperature. These observations are interpreted in respect of the nanocomposite preparation method and the cure kinetics. |
| وصف الملف: | application/pdf |
| اللغة: | English |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cbcbccc483b46c9e65f6475ab871564e http://hdl.handle.net/2117/16040 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....cbcbccc483b46c9e65f6475ab871564e |
| قاعدة البيانات: | OpenAIRE |
| الوصف غير متاح. |