ENTEG seminar by prof. Jean-Marie Raquez

ENTEG guest seminar by prof. Jean-Marie Raquez

How the stereolithography can revolutionize the conception of Polymeric Materials with Adaptive Properties?

Slowly yet steadily, additive manufacturing technologies have become a major player in the fabrication of polymeric devices with controlled architectures such as personalized prototypes, soft electronics, sensors and actuators as well as tissue and biomedical engineering 1, 2 . Based on a layer by layer fabrication, with resolution in the range of micro- to nanometers per layer, the computer-assisted printing significantly speeds up the development of custom 3D devices without actually inflating the costs. Despite the irrefutable progress made around 3D printing, the technique still suffers from rigid and static properties of the printed parts and lack of fabrication approaches controlling the material anisotropy 3 . In light of these limitations, a breakthrough strategy towards designing anisotropy-encoded structures using commercial stereolithography technology is reported by means of controlling either the specific surface area to volume ratio, the crosslinking density or the chemical composition of discrete layers during fabrication 4. The key element here is the time, where the actuation, the sensing and the programmability are directly embedded into the material structure and occur in desired time frames. More precisely, we address the challenge of building more complex 3D objects with elevated adaptive properties towards the 3D-printing of e.g. multi-responsive actuators 4, 5 , piezoionic touch sensors and rapid responsive visible indicators. This work represents a flexible platform for designing more advanced 3D-printed polymeric materials beyond the present study that would promote new potential applications. Keywords: 3D-printing, mutliresponsive materials, stereolithography, free-radical polymerization Acknowledgments This work was funded by the FWV 3D4MED Interreg Grant and LFCM-BIOMAT FEDER J.-M.R. is a senior FNRS research fellow at University of Mons.

References

[1] C. K. Chua and K. F. Leong, 3D Printing and Additive Manufacturing: Principles and Applications, World Scientific, 5th edn., 2015.

[2] L. Gibson, D. Rosen and B. Stucker, additive manufacturing technologies: 3D Printing, Rapid Prototyping, and Direct Digital Manufacturing, Springer, 2015.

[3] S. Guessasma, W. Zhang, J. Zhu, S. Belhabib and H. Nouri, Int. J. Simul. Multisci. Des. Optim., 2015, 6, A9.

[4] J. Odent, S. Vanderstappen, A. Toncheva, E. Pichon, T. J. Wallin, K. Wang, R. F. Shepherd, P. Dubois and J.-M.

Raquez, Journal of Materials Chemistry A, 2019, 7, 15395-15403.

[5] J. Odent, T. J. Wallin, W. Pan, K. Kruemplestaedter, R. F. Shepherd and E. P. Giannelis, Advanced Functional

Materials, 2017, DOI: 10.1002/adfm.201701807, 1701807.