On-Demand and Non-Contact Shape-Fixation Strategy for Microstructures in UV-Responsive Covalent Adaptable Networks
발표자
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초록
내용
Dynamic network exchange reaction allows covalent adaptable networks (CANs) to be malleable and reprocessable analogue of thermosetting polymers. Instead of conventional CANs with thermally activated network exchange reaction, a new CAN bearing both UV- and heat-responsive disulfide bonds is introduced. UV irradiation at room temperature effectively accelerated stress relaxation of this CAN, comparable to those obtained at elevated temperatures (> 100 °C) in the absence of UV irradiation. As a result, UV irradiation can be adopted as on-demand and non-contact shape-fixation method without the use of support structures. To make the most effective use of this, we utilize facile fabrication of three-dimensional (3D) staggered-overlapped microdenticles that show non-contact/spatiotemporal shape-fixation using UV light. In order to further investigate temperature and/or UV-responsive dynamic characteristics, non-equilibrium molecular dynamics (NEMD) simulations were also performed.