WITDRAWN (NO SHOW) 5/5/23 SB07.04 Design Rationale for Polymer Networks—From Stimuli Responsive Hydrogels to Dual-Cure 3D Printable High Performance Polymers

This presentation aims to discuss the design rationale of a class of thermally responsive semi-IPN hydrogels and a series of photo and thermal dual curable liquid monomers that are fit for high resolution precision 3D printing via projection micro-stereolithography (PμSL), leading to 3D printed polymers that are of high strength, stiffness and glass transition temperatures. In the former case, systematic investigation was carried out and discussed on how swelling and deswelling ratios and their kinetics are uniquely tunes and controlled in these stimuli responsive semi-IPN hydrogels. Furthermore, the semi-IPN structure turns out to be ideal for surface deposition of highly robust and conformal polyamide layers onto these hydrogels via interfacial polymerization. In the latter case, the discussion focuses on design dual cure high Tg and high strength polymer networks. Their photo curability and low monomer viscosity allow high resolution stereolithography 3D printing to be readily carried out via a free radical polymerization. Their subsequent thermal curability allows the formation of an extra network via a ring opening reaction. Although unlike the reported double-network systems, these dual network structure endows these polymers with not only extra-robustness such as thermal resistance, high strength and stiffness, but also intrinsic flame resistance among other attributes. Both polymer systems have potentials for various functional and engineering applications.