Affiliation:
1. POLYMAT University of the Basque Country UPV/EHU Avenida Tolosa 72 Donostia‐San Sebastian Guipuzcoa 20018 Spain
2. Departamento de Química Orgánica e Inorgánica University of the Basque Country UPV/EHU Barrio Sarriena s/n Leioa Bizkaia 48940 Spain
3. IKERBASQUE Basque Foundation for Science Plaza Euskadi 5 Bilbao 48009 Spain
Abstract
AbstractFunctional inks for light‐based 3D printing are actively being searched for being able to exploit all the potentialities of additive manufacturing. Herein, a fast visible‐light photopolymerization process is showed of conductive PEDOT:PSS hydrogels. For this purpose, a new Type II photoinitiator system (PIS) based on riboflavin (Rf), triethanolamine (TEA), and poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is investigated for the visible light photopolymerization of acrylic monomers. PEDOT:PSS has a dual role by accelerating the photoinitiation process and providing conductivity to the obtained hydrogels. Using this PIS, full monomer conversion is achieved in less than 2 min using visible light. First, the PIS mechanism is studied, proposing that electron transfer between the triplet excited state of the dye (3Rf*) and the amine (TEA) is catalyzed by PEDOT:PSS. Second, a series of poly(2‐hydroxyethyl acrylate)/PEDOT:PSS hydrogels with different compositions are obtained by photopolymerization. The presence of PEDOT:PSS negatively influences the swelling properties of hydrogels, but significantly increases its mechanical modulus and electrical properties. The new PIS is also tested for 3D printing in a commercially available Digital Light Processing (DLP) 3D printer (405 nm wavelength), obtaining high resolution and 500 µm hole size conductive scaffolds.
Subject
Materials Chemistry,Polymers and Plastics,Organic Chemistry
Cited by
2 articles.
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