Reprocessable epoxy-acrylate 3D-printing resins with improved compatibility
In this work, a practical approach is described to prepare acrylate-epoxy photo-thermal (dual) curing DLP 3-D printing resins that are reprocessable through transesterification. By choosing to perform the thermal cure before or after the photocure, the intermediate, partially-cured material can be o...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2025 |
| 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:2117/432799 |
| Acceso en línea: | https://hdl.handle.net/2117/432799 https://dx.doi.org/10.1016/j.reactfunctpolym.2025.106309 |
| Access Level: | acceso abierto |
| Palabra clave: | Covalent adaptable network Vitrimer 3D printing Beta-hydroxy ester Dual-cure Photoresin Àrees temàtiques de la UPC::Enginyeria dels materials::Materials plàstics i polímers |
| Sumario: | In this work, a practical approach is described to prepare acrylate-epoxy photo-thermal (dual) curing DLP 3-D printing resins that are reprocessable through transesterification. By choosing to perform the thermal cure before or after the photocure, the intermediate, partially-cured material can be obtained in different conditions, offering great flexibility for processing. The polyacrylate and polyepoxide phases are compatibilized by methacrylate-functional carboxylic acids that are initially added to the liquid resin. By employing methacrylate precursors with different chain lengths in the preparation of these coupling agents (CA), the final materials are obtained either as elastomeric or glassy solids. The glass transition temperatures ranged from 5 °C up to 100 °C and Young's moduli ranged from 13 MPa up to 2 GPa. The dynamic behavior was dictated by the choice of the anhydride precursor such that CAs prepared using glutaric anhydride lead to stress relaxation which was an order of magnitude faster than formulations prepared with bulkier anhydrides such as hexahydro-4-methyl phthalic anhydride. The Arrhenius activation energy of relaxation were in the range 90–120 kJ/mol typical of beta-hydroxyester vitrimers. The hot-press reprocessed materials showed near-complete or virtually complete recovery of and . Malleability performance of the materials was either good or excellent. |
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