期刊
ADVANCED SCIENCE
卷 8, 期 22, 页码 -出版社
WILEY
DOI: 10.1002/advs.202102674
关键词
aerogels; liquid crystal elastomers; shape-morphing materials; two-way shape-memory aerogels
资金
- National Natural Science Foundation of China [21971037, 51903048, 52173109]
- Jiangsu Provincial Natural Science Foundation of China [BK20180406]
- Fundamental Research Funds for the Central Universities
This study prepared the first two-way shape-memory liquid crystal elastomer (LCE)-based aerogel, which possesses a liquid crystal phase and good orientation, allowing reversible shape deformation during heating/cooling cycles.
With the advantage of reversible shape-morphing between two different permanent shapes under external stimuli, the two-way shape-memory aerogel is expected to become a preferred aerogel for developing practical applications in actuators, sensors, robotics, and more. Herein, the first two-way shape-memory liquid crystal elastomer (LCE)-based aerogel is prepared by an orthogonal heat and light curing strategy coupled with an intermediate mechanical stretching step. The differential scanning calorimetry, temperature-varied wide-angle X-ray scattering, and polarizing optical microscope results indicate that the aerogel possesses a liquid crystal phase and the insider mesogens are well-oriented along the stretching direction. In addition to having superior compressibility and excellent shape stability, this LCE-based aerogel can perform a reversible shape deformation during the heating/cooling cycles with a shrinkage ratio of 37%. The work, that is disclosed here, realizes a truly two-way shape-memory behavior rather than the one-way shape deformation of traditional polymer aerogel materials, and may promote potential applications of this novel LCE-based aerogel material in control devices, soft actuators, and beyond.
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