Advancing reversible shape memory by tuning the polymer network architecture
Open accessAbstract
Because of counteraction of a chemical network and a crystalline scaffold, semicrystalline polymer networks exhibit a peculiar behavior—reversible shape memory (RSM), which occurs naturally without applying any external force and particular structural design. There are three RSM properties: (i) range of reversible strain, (ii) rate of strain recovery, and (iii) decay of reversibility with time, which can be improved by tuning the architecture of the polymer network. Different types of poly(octylene adipate) networks were synthesized, allowing for control of cross-link density and network topology, including randomly cross-linked network by free-radical polymerization, thiol–ene clicked network with enhanced mesh uniformity, and loose network with deliberately incorporated dangling chains. It is shown that the RSM properties are controlled by average cross-link density and crystal size, whereas topology of a network greatly affects its extensibility. We have achieved 80% maximum reversible range, 15% minimal decrease in reversibility, and fast strain recovery rate up to 0.05 K –1, i.e., ca. 5% per 10 s at a cooling rate of 5 K/min.
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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 [131]
The Introduction and Results and Discussion describe stress-free reversible shape change: heating relaxes a programmed strain, and cooling restores it. Results and Discussion also link network architecture to melting temperature, supporting temperature tuning. This paper does not demonstrate the cited bending/unbending or coiling/uncoiling motions. (LLM, conf=0.86)
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- Authors
- Li, Q., Zhou, J., Vatankhah-Varnoosfaderani, M., Nykypanchuk, D., Gang, O., & Sheiko, S. S.
- Affiliations
- University of North Carolina at Chapel Hill (US)
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
- Brookhaven National Laboratory (US)
- Corresponding author
- Sheiko, Sergei S.
- Venue
- Macromolecules
- Publisher
- American Chemical Society (ACS)
- Published
- 2016-02-02
- Volume
- 49
- Issue
- 4
- Pages
- 1383-1391
- ISSN
- 0024-9297 (ISSN-L)
- 1520-5835
- OpenAlex
- W2270064366
- Cited by
- 61
- References
- 30
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 6 · 2023: 6 · 2022: 8 · 2021: 7 · 2020: 5 · 2019: 8 · 2018: 4 · 2017: 12 · 2016: 2
- FWCI
- 5.93
- Type
- journal article
- Language
- en
- Open access
- green
- doi.org
- Locations
- Macromolecules (publishedVersion)
- Carolina Digital Repository (University of North Carolina at Chapel Hill) (submittedVersion)
- OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
- UNC Libraries
- Funders
- Brookhaven National Laboratory, Office of Science (DE-SC0012704)
- Division of Materials Research (DMR-1121107, DMR-1122483, DMR-1407645, DMR-1436201)
- Topics
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer composites and self-healing
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer crystallization and properties
- Physical Sciences › Engineering › Mechanical Engineering › Advanced Materials and Mechanics
- Keywords
- crosslink density, network topology, dangling chains, crystal size, extensibility, radical crosslinking
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