Rapid, Localized, and Athermal Shape Memory Performance Triggered by Photoswitchable Glass Transition Temperature
Abstract
Shape memory polymers that undergo shape recovery at room temperature (RT) are desirable for their potential in vivo applications, yet challenging. Herein, light-triggered athermal shape memory effect of azopolymer networks is reported by photoswitching the glass transition temperature ( T g ) rather than external heating. Thanks to the switchable T g of azopolymer induced by reversible trans–cis isomerization, the entropic energy is trapped in low T g state ( cis -form T g < RT) to deform into a temporary shape and fixed in high T g state ( trans -form T g > RT). Upon exposure to UV light, the reduced low T g allows release of the entropic energy, realizing athermal shape recovery of the permanent shape. By exploring the shape memory performance, we demonstrate diverse light-induced rapid shape recovery from temporary shape to original shape. Because of the instant, precise, and spatiotemporal manipulation of light, programmable shape recovery of surface topography is further extended. We anticipate that this strategy will provide tremendous opportunities for future precise medicine devices and soft robotics.
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Typically, the shape transformation of SMP starts as soon as a stimulus is exerted.
“Typically, the shape transformation starts as soon as a stimulus is exerted 14 .”
From Shape memory polymer with programmable recovery onset (2023) · cites this paper as [14]
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Shape memory polymer with programmable recovery onset
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“Typically, shape transformation starts as soon as an external stimulus is exerted 14 .”
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- Authors
- Zhang, X., Zhu, C., Xu, B., Qin, L., Wei, J., & Yu, Y.
- Affiliations
- Fudan University (CN)
- Corresponding author
- Yu, Yanlei
- Venue
- ACS Applied Materials & Interfaces
- Publisher
- American Chemical Society (ACS)
- Published
- 2019-11-13
- Volume
- 11
- Issue
- 49
- Pages
- 46212-46218
- ISSN
- 1944-8244 (ISSN-L)
- 1944-8252
- OpenAlex
- W2989136100
- Cited by
- 74
- References
- 48
- Citations by year
- 2026: 2 · 2025: 8 · 2024: 12 · 2023: 13 · 2022: 21 · 2021: 10 · 2020: 7 · 2019: 1
- FWCI
- 5.48
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- ACS Applied Materials & Interfaces (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Natural Science Foundation of China (21734003)
- National Key R&D Program of China (2016YFA0202902)
- Innovation Program of Shanghai Municipal Education Commission (2017-01-07-00-07-E00027)
- Topics
- Physical Sciences › Engineering › Mechanical Engineering › Advanced Materials and Mechanics
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer composites and self-healing
- Physical Sciences › Materials Science › Materials Chemistry › Photochromic and Fluorescence Chemistry
- Keywords
- shape memory polymers, trans-cis isomerization, soft robotics
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