Synthesis of UV Curable, Highly Stretchable, Transparent Poly(urethane-acrylate) Elastomer and Applications Toward Next
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DOI 10.1007/s13233-020-8125-x
www.springer.com/13233 pISSN 1598-5032 eISSN 2092-7673
Synthesis of UV Curable, Highly Stretchable, Transparent Poly(urethaneacrylate) Elastomer and Applications Toward Next Generation Technology Seohyun Kim† Juheon Lee† Haksoo Han*
Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul 03722, Korea Received October 11, 2019 / Revised May 21, 2020 / Accepted May 24, 2020
Abstract: Here, highly stretchable and transparent UV curable poly(urethane-acrylate) elastomer has been synthesized by reacting urethane acrylate oligomer and two reactive diluents monomers. The synthesized elastomers can be stretched up to 600% and have high transparency of over 90% transmittance. The synthesized elastomers have been applied to several applications. Simple 3D model was printed with a 3D printer on the market. Stretchable ionic conductors were fabricated by a facile method of adding salt with ionic conductivity. Similarly, the resin with β-cyclodextrin, a cage-structured molecule, was cured and foam was generated simultaneously under the UV radiation. This research paves a new way for further development in applications of UV curable transparent elastomer and 3D printable elastomeric material. Keywords: UV curable, stretchable, transparent, elastomer, 3D printing.
1. Introduction Elastomers including natural or synthetic rubber have been extensively researched and widely utilized for centuries due to their excellent material properties of elasticity, resilience, and electrical and thermal insulations.1,2 Modern technologies enabled the diverse usages and applications of the elastomer, which include ionic conductor,3 automotive, flexible electronics, energy absorbers and soft machines.4,5 To synthesize new high-performance elastomers, it is important to improve both mechanical strength and elasticity, which are trade-off relationships.2,6 The elasticity of elastomer is expressed by the crosslink structure of polymer chain like a ladder structure, considering the conformation of polymer chain.7 In general, the morphology of the polymer elastomer is amorphous and the polymer chain is entangled in the form of a random coil. When an external stress is applied to the elastomer, the crosslink structure is supported so that the entanglement of the polymer chain can be released and returned to its original state.2,8,9 On the other hand, if there are too many crosslinks, the entanglement of the polymer chain will not be released and elasticity will suppress. Therefore, in urethane acrylate elastomer, good control of structure and ratio of crosslinker urethane diacrylate and main chain monoacrylate is the main factor of highperformane elastomer synthesis. Furthermore, existing thermal curing elastomers encounter problems of flammability and Acknowledgment: This research was supported by Basic Science Research Program National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2017R1D1A1B03033332). *Corresponding Author: Haksoo Han ([email protected])
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