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< leader > nam a 5i 4500 </ leader >
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< subfield code =" a " > impresión 3D </ subfield >
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< subfield code =" a " > termoestáble </ subfield >
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< subfield code =" a " > Epoxy </ subfield >
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< subfield code =" a " > acrilato </ subfield >
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< subfield code =" a " > reciclado </ subfield >
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< subfield code =" a " > 3D printable hybrid acrylate-epoxy vitrimer resins with improved compatibility and reprocessability </ subfield >
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< subfield code =" a " > [Barcelona] : </ subfield >
< subfield code =" b " > Universitat Politècnica de Catalunya, </ subfield >
< subfield code =" c " > 2026 </ subfield >
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< subfield code =" z " > Accés lliure </ subfield >
< subfield code =" u " > http://hdl.handle.net/10803/696400 </ subfield >
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< subfield code =" a " > Casado Gómez, Jaime, </ subfield >
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< subfield code =" a " > Universitat Politècnica de Catalunya. Departament d'Enginyeria Química </ subfield >
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< subfield code =" a " > Tesis i dissertacions electròniques </ subfield >
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< subfield code =" a " > Fernández Francos, Xavier, </ subfield >
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< subfield code =" a " > Konuray, Ali Osman, </ subfield >
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< subfield code =" a " > (English) The Covalent Adaptable Networks (CANs) made of polymeric materials that use dynamic covalent chemistry, allowing bonds to break and reform when stimulated, combine the mechanical properties of thermoset polymers with the ability to be reprocessed and recycled. The integration of 3D printing technology with CANs represents a significant advancement in the field of manufacturing polymer components. This innovative process offers the functional benefits of a thermoset along with the recycling advantages of a thermoplastic, making it a highly sustainable solution. In the following collection of articles, a group of novel dual-curing thermosetting materials have been designed, optimised and improved regarding their compatibility and reprocessability. In the first article, we successfully crafted four genuine resins and explored how their behaviour and properties were influenced by the unique combinations and proportions of their formulation ingredients. The original dual-curing system was performed by means of homogenously mixing an epoxy resin with a di-acrylate monomer rich in β-hydroxy ester and hydroxyls, a dicarboxylic acid and a coupling agent in a fixed proportion. The use of different transesterification catalysts in varying proportions, a methacrylate monomer and a photoinitiator round off the formulation. The combination of these chemicals results in the formation of a hybrid network, which is capable of undergoing transesterifications reactions. The 3D-printed and fully-cured parts from these four innovative resins have proven that their thermo-mechanical properties are in line with the designed specifications. Their repair and recycle capabilities are facilitated by a CAN structure. In the second article, we have optimised the formulations of 3D printable vitrimer resins with the objective of enhancing their processing, mechanical properties, and repairability/reprocessability. An improvement of the formulation was achieved through the determination of the optimal quantities of acrylates and coupling agent. A selection of epoxy resins was also made with the aim of identifying the best performing option. The resins developed in this part of the research have offered a more suitable viscosity for handling in the 3D printer. It has been demonstrated as well that parts printed from these improved resins and subsequently double-cured have shown an enhancement in their thermo-mechanical behaviour. In the third article, we have advanced our research in two key areas. Firstly, we have taken a further step in the facilitation of the Vitrimer formulation elaboration by improving the mixability of the chemical compounds. This improvement involved replacing a powder carboxylic acid with a taylor-made liquid coupling agent. Secondly, an evaluation of the thermo-mechanical behaviour of the fully cured resin was carried out, depending on the sequence of thermal and UV curing stages. The materials developed in this study have demonstrated efficacy in the effective relaxation of internal stresses, attributable to the high dynamic β-hydroxyester groups content. Consequently, processes such as reshaping, repairing, or complete recycling are enabled. Furthermore, modifications made to the resin formulations enabled the production of thermosets with customised mechanical properties. All these properties offer new possibilities for the production of parts using techniques such as 3D printing and thermal post-curing, providing a viable, sustainable and more convenient alternative for the thermosetting materials industry. </ subfield >
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