| 초록 |
The incorporation of dynamic covalent bonds within liquid crystal elastomers (LCEs) can bring great benefits including reprocessability and self-healing capability which are not allowed in the conventional LCEs. In this study, we synthesized a new class of LC vitrimers by Michael addition between diacrylate-functionalized LC monomers and diamine-functionalized poly(ether-thiourea) as crosslinkers. Most interestingly, the resulting LCEs were not only mechanically aligned by uniaxial stretching allowing the reversible thermal actuation, but also reprocessible and reconfigurable when heated around 140 oC due to dynamic nature of thiourea linkages. Specifically, we demonstrated the small fragments of LCEs can be reprocessed into a homogeneous film by compression molding, and the multiple permanent shapes can be obtained thanks to the plasticity of dynamic covalent networks. |
