Digital light processing 3D printing of dynamic magneto-responsive thiol-acrylate composites

Ines Cazin, Elisabeth Rossegger, Ignazio Roppolo, Marco Sangermano, Petra Granitzer, Klemens Rumpf, Sandra Schlögl

Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung


Additive manufacturing is one of the most promising processing techniques for fabricating customized 3D objects. For the 3D printing of functional and stimuli-triggered devices, interest is steadily growing in processing materials with magnetic properties. Synthesis routes for magneto-responsive soft materials typically involve the dispersion of (nano)particles into a non-magnetic polymer matrix. Above their glass transition temperature, the shape of such composites can be conveniently adjusted by applying an external magnetic field. With their rapid response time, facile controllability, and reversible actuation, magnetically responsive soft materials can be used in the biomedical field (e.g. drug delivery, minimally invasive surgery), soft robotics or in electronic applications. Herein, we combine the magnetic response with thermo-activated healability by introducing magnetic Fe3O4 nanoparticles into a dynamic photopolymer network, which undergoes thermo-activated bond exchange reactions. The resin is based on a radically curable thiol-acrylate system, whose composition is optimized towards processability via digital light processing 3D printing. A mono-functional methacrylate phosphate is applied as a stabilizer to increase the resins' shelf life by preventing thiol-Michael reactions. Once photocured, the organic phosphate further acts as a transesterification catalyst and activates bond exchange reactions at elevated temperature, which render the magneto-active composites mendable and malleable. The healing performance is demonstrated by recovering magnetic and mechanical properties after the thermally triggered mending of 3D-printed structures. We further demonstrate the magnetically driven movement of 3D-printed samples, which gives rise to the potential use of these materials in healable soft devices activated by external magnetic fields.
Seiten (von - bis)17536-17544
FachzeitschriftRSC Advances
PublikationsstatusElektronische Veröffentlichung vor Drucklegung. - 9 Juni 2023

Bibliographische Notiz

Funding Information:
The research work was performed within the COMET-Module project “Chemitecture” (project-no. 21647048) at the Polymer Competence Center Leoben GmbH (PCCL, Austria) within the framework of the COMET-program of the Federal Ministry for Transport, Innovation and Technology and the Federal Ministry for Digital and Economic Affairs with contributions by Montanuniversitaet Leoben, Politecnico di Torino, Helios TBLUS and bto-epoxy. Funding is provided by the Austrian Government and the State Government of Styria. In addition, the authors thank David Reisinger (PCCL) for performing stress-relaxation experiments and Walter Alabiso (PCCL) for carrying out the DMA measurements.

Publisher Copyright:
© 2023 The Royal Society of Chemistry

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