2026-04-13T15:07:19Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/4327992026-01-27T04:30:50Zcom_2072_1033col_2072_452950

urn:hdl:2117/432799 Reprocessable epoxy-acrylate 3D-printing resins with improved compatibility Casado Gómez, Jaime Faja, Alba Moradi, Sasan Ramis Juan, Xavier Konuray, Ali Osman Fernández Francos, Xavier Àrees temàtiques de la UPC::Enginyeria dels materials::Materials plàstics i polímers Covalent adaptable network Vitrimer 3D printing Beta-hydroxy ester Dual-cure Photoresin 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. The authors acknowledge the funding sources disclosed below. The authors thank Po.Int.ErS.R.L. for supplying the epoxy resin. The authors also thank Armando Escribá Flores for his help with the DLP-3D print ing. X. Fernández-Francos and O. Konuray acknowledge the Serra- Húnter programme (Generalitat de Catalunya). Funding: this work was funded by the Spanish Ministry of Science and Innovation (MCIN/AEI/10.13039/501100011033) through the R&D projects PID2020-115102RB-C22 and PID2023-147128OB-C21, as well as by the Generalitat de Catalunya (2021-SGR-00154). Peer Reviewed Postprint (author's final draft) 2025-09 Article https://www.sciencedirect.com/science/article/pii/S1381514825001610 info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-115102RB-C22/ES/PROCESADO DUAL DE VITRIMEROS: IMPRESION 3D/ info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2023-147128OB-C21/ES/DISEÑO A MEDIDA DE REDES POLIMERICAS COVALENTES DINAMICAS OBTENIDAS MEDIANTE CURADO DUAL PARA APLICACIONES FUNCIONALES/ http://creativecommons.org/licenses/by-nc-nd/4.0/ Open Access Attribution-NonCommercial-NoDerivatives 4.0 International Elsevier