title: Effects of incorporation of organically modified montmorillonite on the reaction mechanism of epoxy/amine cure.
abstract: The aim of this study is to understand the effect of nonmodified or different organically modified montmorillonites on the reaction mechanism of epoxy/amine cure. The reference material consists of diglycidyl ether of bisphenol A (DGEBA) and 1,3-phenylene diamine (mPDA) in stoichiometric proportions. The reaction with various organically modified montmorillonites (I28E, I34TCN, and MMTm) is compared to highlight the catalytic effect of MMT water content and of the alkylammonium cations on the epoxy/amine reaction mechanism. In the absence of mPDA curing agent, DGEBA develops homopolymerization reactions with I28E, I34TCN, and MMTm. Chemorheological kinetics and advanced isoconversional analysis of epoxy cure are studied by rheometrical measurements and differential scanning calorimetry (DSC). Molecular mobility of the system under curing is modified in the presence of montmorillonites. Finally, the study underlines the role of montmorillonites and the influence of the change in reaction mechanisms on glass transition of the nanocomposites.
authors.affiliation: Laboratoire de Physique de la Matière Condensée, Université de Nice - Sophia Antipolis , CNRS UMR 7336, Parc Valrose, 06108 Nice Cedex 2, France.
authors.forename: Camille
authors.initials: C
authors.lastname: Alzina
authors.forename: Alice
authors.initials: A
authors.lastname: Mija
authors.forename: Luc
authors.initials: L
authors.lastname: Vincent
authors.forename: Nicolas
authors.initials: N
authors.lastname: Sbirrazzuoli