Preparation of new dual-cured multifunctional thermosets from mixtures of epoxy and vinyl compounds
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Thermosettings polymers are materials with high thermal stability because of its tridimensional crosslinked network by covalent links. Due to these characteristics, they are very useful in industry. Dual-curing is a combination of two processes where at the end a thermoset is obtained. Both processes are different so in the first stage it is obtained a completely cured thermoplastic or thermosetting polymer and in the second stage it is obtained another thermoset similar or different from the intermediate stage polymer. Dual-curing is an alternative process that allows obtaining tailored materials and nowadays, it is studied because of its innovation. In this project, a particular dual-curing case is studied, using mixtures of acrylates/methacrylats with epoxy resins. Epoxy resin used is Glycidyl methacrylate, a resin that also incorporates a methacrylate group. In this case, dual-curing consists in a radical chain polymerization of acrylates and methacrylates resins by photocuring and a cationic polymerization of epoxies by thermal curing. In the first part, acrylate and methacrylate monomers which are used through the entire project are studied separately with the purpose of obtaining, by combination of them, linear or crosslinked polymers at the intermediate stage, with tailorable thermomechanical properties. In the second part, thermal curing and kinetics are studied to simulate results in isothermal conditions. In order to ensure safe storage stability and stable properties in the intermediate stage between photocuring and thermal curing, the use of reaction stabilizers effect is studied and verified experimentally. Finally, thermal-mechanical properties of the materials after the photocuring process and after the thermal curing process have been analyzed.