| 초록 |
Liquid crystalline elastomers (LCEs) are renowned for reversible shape transformation under external stimuli which causes the reduction in order. In the thermotropic LCEs, the shape transformation parallel to the director orientation occurs when heated above the nematic-isotropic transition temperature (Tni). In this study, we synthesized a series of surface aligned LCEs by aza-Michael addition between diacrylate functionalized nematic monomers and alkylamine chain extenders followed by photopolymerization. In particular, we used the spacer length of nematic monomers and the type of chain extender as a handle to manipulate actuation temperature of LCEs. Specifically, both Tni and actuation temperature can be altered by the choice of methylene spacer as well as the amine chain extenders. Our simple and efficient strategy to manipulate the actuation properties of the LCEs can advance in developing actuators for soft robots and dynamic surfaces. |
