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- Title
Fast Visible‐Light 3D Printing of Conductive PEDOT:PSS Hydrogels.
- Authors
Lopez‐Larrea, Naroa; Gallastegui, Antonela; Lezama, Luis; Criado‐Gonzalez, Miryam; Casado, Nerea; Mecerreyes, David
- Abstract
Functional 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.
- Subjects
THREE-dimensional printing; HYDROGELS; 3-D printers; VISIBLE spectra; CHARGE exchange; PHOTOPOLYMERIZATION
- Publication
Macromolecular Rapid Communications, 2024, Vol 45, Issue 1, p1
- ISSN
1022-1336
- Publication type
Article
- DOI
10.1002/marc.202300229