| 초록 |
Herein, we synthesized hygroscopic liquid crystal elastomer incorporating dimethylamino moieties that can be prepared by surface alignment and 3D printing. The humidity-responsive properties are introduced by activating one of the LCE surfaces with acidic solution, which provides asymmetric hydrophilicity to the LCE. Resulting humidity-responsive LCE undergoes programmed and reversible hygroscopic actuation, and its shape transformation can be directed by cut angle with respect to nematic director or by localizing activation regions in the LCE. We also modulated the degree of actuation with factors such as thickness and cross-linking density. Furthermore, various humidity-responsive LCE actuators, including a concentric square array and a soft gripper, are successfully fabricated by employing LC inks in DIW 3D printing. Most importantly, by preparing 3-dimensional bilayer actuators that printed in z-direction as well, we suggested possibility of 4D printing of humidity-responsive LCE. |
