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'Self‐Lockable' Liquid Crystalline Diels–Alder Dynamic Network Actuators with Room Temperature Programmability and Solution Reprocessability
- Source :
- Angewandte Chemie International Edition. 59:4925-4931
- Publication Year :
- 2020
- Publisher :
- Wiley, 2020.
-
Abstract
- Novel main-chain liquid crystalline Diels-Alder dynamic networks (LCDANs) were prepared that exhibit unprecedented ease for actuator programming and reprocessing compared to existing liquid crystalline network (LCN) systems. Following cooling from 125 °C, LCDANs are deformed with aligned mesogens self-locked at room temperature by slowly formed Diels-Alder (DA) bonds, which allows for the formation of solid 3D actuators capable of reversible shape change, and strip walker and wheel-capable light-driven locomotion upon either thermally or optically induced order-disorder phase transition. Any actuator can readily be erased at 125 °C and reprogrammed into a new one under ambient conditions. Moreover, LCDANs can be processed directly from melt (for example, fiber drawing) and from solution (for example, casting tubular actuators), which cannot be achieved with LCNs using exchangeable covalent bonds. The combined attributes of LCDANs offer significant progress toward developing easily programmable/processable LCN actuators.
- Subjects :
- Phase transition
Materials science
Dynamic network analysis
Shape change
010405 organic chemistry
Liquid crystalline
02 engineering and technology
General Medicine
General Chemistry
021001 nanoscience & nanotechnology
010402 general chemistry
01 natural sciences
Casting
Catalysis
0104 chemical sciences
Covalent bond
Diels alder
Composite material
0210 nano-technology
Actuator
Subjects
Details
- ISSN :
- 15213773 and 14337851
- Volume :
- 59
- Database :
- OpenAIRE
- Journal :
- Angewandte Chemie International Edition
- Accession number :
- edsair.doi.dedup.....83840bf83666fe52007c02edb245f34b