Synergetic Chemical and Physical Programming for Reversible Shape Memory Effect in a Dynamic Covalent Network with Two Crystalline Phases
Abstract
A recently emerged reversible shape memory effect greatly extends the capability of shape memory polymers and their practical potential. Physical confinement and chemical fixation are individually known to be effective in introducing network anisotropy essential for reversible shape memory. Herein, we demonstrate that synergetic combination of these two mechanisms effectively diversifies the shape-shifting behavior. Specifically, we introduce a transesterification catalyst into a network containing two crystalline phases: poly(ε-caprolactone) (PCL) and poly(ω-pentadecalactone) (PPDL). The reversible shape memory behavior of the resulting system can be programmed via the physical confinement by the PPDL phase and the chemical plasticity by the dynamic ester exchange. We illustrate that the two programming mechanisms can operate in a noninterfering way that allows achieving a synergetic benefit, notably realizing a zero-set reversible shape memory behavior. Our study points to a direction in diversifying the behaviors of reversible shape memory polymers and expands the scope for potential engineering devices.
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To achieve stress-free reversible shape memory, current approaches rely on introduction of internal stress, typically necessitating two crystalline phases.
“To achieve stress-free reversible shape memory33–36, current approaches rely on the introduction of an internal stress. This typically necessitates the use of two crystalline phases in which the high melting phase provides the internal stress whereas the low melting phase serves as the actuation phase33–35.”
From On demand shape memory polymer via light regulated topological defects in a dynamic covalent network (2020) · cites this paper as [34]
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- Authors
- Song, H., Fang, Z., Jin, B., Pan, P., Zhao, Q., & Xie, T.
- Affiliations
- State Key Laboratory of Chemical Engineering (CN)
- Corresponding author
- Zhao, Qian
- Xie, Tao
- Venue
- ACS Macro Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2019-05-24
- Volume
- 8
- Issue
- 6
- Pages
- 682-686
- ISSN
- 2161-1653 (ISSN-L)
- OpenAlex
- W2945636381
- Cited by
- 91
- References
- 26
- Citations by year
- 2026: 7 · 2025: 13 · 2024: 9 · 2023: 19 · 2022: 15 · 2021: 13 · 2020: 8 · 2019: 7
- FWCI
- 4.59
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- ACS Macro Letters (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Ministry of Education of the People's Republic of China (2018RC020)
- National Natural Science Foundation of China (21625402, 51673169, 51822307)
- Natural Science Foundation of Zhejiang Province (LR18E030001)
- State Key Laboratory of Chemical Engineering (SKL-ChE-17D03)
- Topics
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer composites and self-healing
- Physical Sciences › Engineering › Mechanical Engineering › Advanced Materials and Mechanics
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer crystallization and properties
- Keywords
- shape memory polymers, dynamic covalent networks, physical confinement, chemical fixation, transesterification catalysts, ester exchange, polycaprolactone
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