Two-way shape memory behavior of semi-crystalline elastomer under stress-free condition
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Abstract Semi-crystalline shape memory polymers exhibit two-way shape memory effect (2W-SME) under constant stresses through crystallization-induced elongation upon cooling and melting-induced constriction upon heating. The applied constant stress influenced the prediction and usability of 2W-SME in practical applications without any external force. Here the reversible shape transition in EVA-shaped memory polymer was quantitative analyzed under a suitable temperature range and external stress-free condition. The fraction of reversible strain increased with increasing upper temperature ( T high ) within the temperature range and reached the maximum value of 13.62% at 70 °C. However, reversible strain transition was almost lost when T high exceeded 80 °C because of complete melting of crystalline scaffold, known as the latent recrystallization template. The non-isothermal annealing of EVA 2W-SMP under changing circulating temperatures was confirmed. Moreover, the orientation of crystallization was retained at high temperatures. These findings may contribute to design an appropriate shape memory protocol based on application-specific requirements.
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Contributions to stress-free two-way SMPs show the possibility of achieving complex reversible shape changes such as elongation/contraction, bending/unbending, and coiling/uncoiling, and of tuning the actuation temperature.
“Contributions to this class can be found, e.g., in [128-135], and show the possibility of achieving complex reversible shape changes (e.g., elongation/contraction, bending/unbending, coiling/uncoiling), and of tuning the actuation temperature.”
From Two-Way and Multiple-Way Shape Memory Polymers for Soft Robotics: An Overview (2020) · cites this paper as [132]
Section 3.2 reports stress-free elongation and contraction and a strip that repeatedly unfolds and refolds between ‘I’ and ‘Z’ shapes. It also reports that annealing can increase the upper operating temperature. The paper does not demonstrate coiling/uncoiling or establish that the actuation temperature itself can be tuned. (LLM, conf=0.88)
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References 34 · Cited by 68
- Authors
- Qian, C., Dong, Y., Zhu, Y., & Fu, Y.
- Affiliations
- Zhejiang Sci-Tech University (CN)
- Venue
- Smart Materials and Structures
- Publisher
- IOP Publishing
- Published
- 2016-07-19
- Volume
- 25
- Issue
- 8
- Pages
- 085023
- ISSN
- 0964-1726 (ISSN-L)
- 1361-665X
- OpenAlex
- W2489942847
- Cited by
- 68
- References
- 34
- Citations by year
- 2026: 4 · 2025: 4 · 2024: 5 · 2023: 6 · 2022: 10 · 2021: 9 · 2020: 11 · 2019: 9 · 2018: 6 · 2017: 4
- FWCI
- 5.63
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Smart Materials and Structures (publishedVersion)
- Funders
- Zhejiang Sci-Tech University graduate innovation foundation (YCX14005)
- National Natural Science Foundation of China (51473147)
- 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 › Polymers and Plastics › Polymer crystallization and properties
- Keywords
- two-way shape memory effect, ethylene vinyl acetate, reversible strain, non-isothermal annealing, crystal orientation
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