Sequential curing of thiol-acetoacetate-acrylate thermosets by latent Michael addition reactions
Thiol-acetoacetate-acrylate ternary dual-curing thermosets were prepared by a sequential process consisting of thiol-Michael addition to acrylates at room temperature followed by Michael addition of acetoacetates to acrylates at moderately elevated temperature. The curing sequence can be controlled...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2017 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/103098 |
| Acceso en línea: | https://hdl.handle.net/2117/103098 https://dx.doi.org/10.1016/j.polymer.2017.02.072 |
| Access Level: | acceso abierto |
| Palabra clave: | Heat resistant plastics Catalysts Addition reactions Michael addition Acetoacetate Acrylate Thermosets Photobase Plàstics termostables Catalitzadors Reaccions d'addició Àrees temàtiques de la UPC::Enginyeria dels materials::Materials plàstics i polímers Àrees temàtiques de la UPC::Enginyeria química::Química orgànica |
| Sumario: | Thiol-acetoacetate-acrylate ternary dual-curing thermosets were prepared by a sequential process consisting of thiol-Michael addition to acrylates at room temperature followed by Michael addition of acetoacetates to acrylates at moderately elevated temperature. The curing sequence can be controlled with the help of the different acidities of the protons on thiol and acetoacetate groups, the favorable pKa of the base used as catalyst and the self-limiting character of Michael additions. The latency of the curing steps can be regulated by selection of the right catalysts, temperature and curing conditions. The properties of the intermediate and final materials can be tuned by changing the structure of the monomers and the contribution of both Michael addition reactions. |
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