Autor según el artículo: Konuray O; Di Donato F; Sangermano M; Bonada J; Tercjak A; Fernández-Francos X; Serra ; Ramis X

Departamento: Química Analítica i Química Orgànica

Autor/es de la URV: Fernández Francos, Xavier / Serra Albet, Maria Angels

Palabras clave: Thermosetting resins Stereolithography Projection Polyester Optimization Ether Epoxy thermosets Epoxy Dual-curing Cationic-polymerization Accuracy

Resumen: © 2020, BME-PT and GTE. All rights reserved. Stereolithography (SL) stands out as a relatively fast additive manufacturing method to produce thermoset components with high resolutions. The majority of SL resins consist of acrylate monomers which result in materials with cur-ing-induced shrinkage problems and this, in addition to the incomplete and non-uniform conversions reached in the SL process, results in poor mechanical properties. To address this issue, a dual-curing formulation was developed by mixing an epoxy monomer into a commercial multi-acrylate SL resin: the first curing stage is acrylate free-radical photopolymerization at ambient temperature, and the second curing stage is cationic epoxy homopolymerization at higher temperatures. The fully dual-cured materials are macroscopically homogeneous, with nanoscale domains observed by Atomic Force Mi-croscopy (AFM), and with unimodal tan delta peaks observed in Dynamic Mechanical Analysis (DMA). The uncured material was storage stable at ambient conditions for at least 9 weeks since the epoxy part was virtually unreactive at these temper-atures. With the dual-cured materials, a nearly 10-fold increase in Young’s modulus was achieved over the neat acrylate resin. At the thermal curing stage, the presence of diperoxyketal thermal radical initiator to the liquid formulation facilitated the polymerization of unreacted acrylates that remained from the SL process simultaneously with epoxy homopolymerization and helped the material attain improved properties.

Áreas temáticas: Química Polymers and plastics Polymer science Physical and theoretical chemistry Organic chemistry Odontología Materials chemistry Materiais Interdisciplinar General chemical engineering Farmacia Engenharias iv Engenharias iii Engenharias ii Ciências biológicas iii Ciências biológicas i Ciências ambientais Chemical engineering (miscellaneous) Chemical engineering (all) Biotecnología Astronomia / física

Acceso a la licencia de uso: https://creativecommons.org/licenses/by/3.0/es/

ISSN: 1788-618X

Direcció de correo del autor: xavier.fernandez@urv.cat angels.serra@urv.cat

Identificador del autor: 0000-0002-3492-2922 0000-0003-1387-0358

Página final: 894

Fecha de alta del registro: 2023-02-19

Volumen de revista: 14

Versión del articulo depositado: info:eu-repo/semantics/publishedVersion

Enlace a la fuente original: https://upcommons.upc.edu/handle/2117/329558

URL Documento de licencia: http://repositori.urv.cat/ca/proteccio-de-dades/

Referencia al articulo segun fuente origial: Express Polymer Letters. 14 (9): 881-894

Referencia de l'ítem segons les normes APA: Konuray O; Di Donato F; Sangermano M; Bonada J; Tercjak A; Fernández-Francos X; Serra ; Ramis X (2020). Dual-curable stereolithography resins for superior thermomechanical properties. Express Polymer Letters, 14(9), 881-894. DOI: 10.3144/expresspolymlett.2020.72

DOI del artículo: 10.3144/expresspolymlett.2020.72

Entidad: Universitat Rovira i Virgili

Año de publicación de la revista: 2020

Página inicial: 881

Tipo de publicación: Journal Publications