2026-04-17T07:38:28Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/1332442026-01-27T02:59:03Zcom_2072_1033col_2072_452950

00925njm 22002777a 4500 dc Santín Serrano, David author Konuray, Ali Osman author Fernández Francos, Xavier author Ramis Juan, Xavier author 2019-03-01 The curing kinetics of a sequential dual-curing system based on an off-stoichiometric amine-epoxy formulation with intermediate latent reactivity has been analyzed. The first curing stage is an epoxy-amine polycondensation taking place at low temperatures, while the second curing stage is an anionic homopolymerization of the excess epoxy groups, taking place at high temperatures and catalyzed by a latent base. The different reactivity of both polymerization processes allows an excellent separation into well-defined curing stages each of which can be analyzed individually. The kinetics of the two curing stages have been analyzed by integral isoconversional procedures and model-fitting methods. Both methodologies successfully simulated each curing stage and also the global curing process, showing that it is possible to control the activation of both curing stages. Isoconversional integral analysis is a simple yet powerful method that can be used for the simulation of temperature-controlled curing programmes. Model-fitting analysis is more suitable for the flexible simulation of processing scenarios such as the curing of composites. Postprint (author's final draft) Àrees temàtiques de la UPC::Enginyeria dels materials::Materials plàstics i polímers Àrees temàtiques de la UPC::Enginyeria química::Química física Chemistry, Physical and theoretical Polymers Epoxy Amine Dual-curing Latent base Thermosets Kinetics analysis Fisicoquímica Polímers Kinetics analysis and simulation of sequential epoxy dual-curing systems with independent thermal activation