Sequential photo-thermal curing of (meth)acrylate-epoxy thiol formulations
| Autor: | Silvia De la Flor, Angels Serra, Xavier Ramis, Adrià Roig |
|---|---|
| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament de Màquines i Motors Tèrmics, Universitat Politècnica de Catalunya. POLTEPO - Polímers Termoestables Epoxídics |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Glycidyl methacrylate
UV-Curing Materials science Polymers and Plastics Polymers Thermal thiol-epoxy Física::Termodinàmica [Àrees temàtiques de la UPC] Enginyeria dels materials::Materials plàstics i polímers [Àrees temàtiques de la UPC] Dual-curing chemistry.chemical_compound Thermoset composites Polymer chemistry Materials Chemistry Termodinàmica Thiol-epoxy Thiol-ene Trimethylolpropane Curing (chemistry) Acrylate Física [Àrees temàtiques de la UPC] Organic Chemistry Homopolymerization Epoxy Polímers Thermogravimetry Adhesius--Indústria i comerç Monomer chemistry visual_art visual_art.visual_art_medium UV-initiated thiol-(meth)acrylate reaction Adhesives industry Thermomechanical analysis Thermodynamics Glycidylmethacrylate |
| Zdroj: | UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
| Popis: | In this work, a novel dual-curing procedure has been developed. It is a combination of a first radical UV-initiated thiol-(meth)acrylate reaction, followed by a second thermal thiol-epoxy step catalysed by a base. Since (meth)acrylates can lead to homopolymerization by radical mechanism, the amount of thiol has to be optimized to reach cross-linked materials with Tgs above room temperature and good mechanical performance. It should be considered, that if the amount of thiol in the intermediate materials is too low, epoxy homopolymerization can take place during the second step. The use of glycidyl methacrylate in combination with trifunctional meth (acrylates) allows this system to gel in the 1st stage and avoids possible dripping or exudation of free monomers during the storage of the intermediate materials. Moreover, this compound reacts in both stages acting as a covalent coupling between (meth)acrylates and epoxy networks. We selected trimethylolpropane tris(3-mercaptopropionate) as the thiol, 2,2-dimethoxy-2-phenylacetophenone as UV initiator and 1-methylimidazole as the base catalyst. The curing evolution was studied by DSC and FTIR. All the materials obtained were characterized by thermogravimetry, thermomechanical analysis and tensile tests. |
| Databáze: | OpenAIRE |
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