Cited by 208Advanced Materials and MechanicsPolymer composites and self-healingAdvanced Cellulose Research Studies

Rapidly switchable water-sensitive shape-memory cellulose/elastomer nano-composites

Zhu, Yong, Hu, Jinlian, Luo, Hongsheng, Young, Robert J., Deng, Libo, Zhang, Shen, Fan, Ying, Ye, Guangdou·2012·Soft Matter

Abstract

We report a new phenomenon in which the reversible formation and disruption of a cellulose nano-whisker (CNW) percolation network in an elastomeric thermoplastic polyurethane (TPU) matrix leads to an unprecedentedly rapidly switchable shape-memory effect (SME) that may be activated by water. The materials have been fully characterized to investigate the SME phenomenon using a number of different experimental techniques including cyclic tensile deformation, dynamic mechanical analysis, FTIR and polarized Raman spectroscopy. A model is developed in which it is shown that exposure to water allows breakup of the CNW percolation network so that the flexible elastomer matrix can be deformed to the desired shape. The CNW percolation network reforms after drying to provide a fixing force for the temporary shape. The entropy elasticity of the TPU matrix then enables rapid shape recovery when the CNW percolation network is disrupted again during wetting. This completely athermal water-sensitive SME mechanism is totally different from traditional ones, in which the water or other solvents are used as plasticizers to lower the glass transition temperature of shape memory polymers, so as to allow triggering of the shape recovery at room temperature or lower. The reported work provides a novel and effective strategy to achieve rapidly switchable shape recovery in a material by a simple wetting process and fixing through an easily applicable programmed drying process.

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Registry

Crossref · 10.1039/c2sm07035a

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56 of 56 references verified0 citation errors · 0 not checkable

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  • Zhu et al. prepared cellulose nanowhisker/polyurethane elastomer showing water-active SME with rapid shape fixing and rapid shape recovery after a mild programming cycle.

    “Zhu et al. [412] prepared cellulose nanowhisker/ polyurethane elastomer showing water-active SME with rapid shape fixing (removal of the water from SMPs) and rapid shape recovery (penetration of water into SMPs) after a mild programming cycle.”
  • The water triggering in Zhu et al.'s sample was based on the combination of nanofiller percolation network chemo-mechanical adaptability and the entropic elasticity of the elastomer.

    “The sample water triggering in this case was made on the successful combination of the nanofiller percolation network chemo-mechanical adaptability and the entropic elasticity of the elastomer.”
  • Zhu et al. (2012) reported elastomeric thermoplastic PU/CNCs materials with rapidly switchable shape recovery of 10 min.

    “in 2012 Zhu et al. reported novel and effective strategy to design elastomeric thermoplastic PU/CNCs materials with rapidly switchable shape recovery (10 min) [184].”

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Authors
Zhu, Y., Hu, J., Luo, H., Young, R. J., Deng, L., Zhang, S., Fan, Y., & Ye, G.
Affiliations
  • Hong Kong Polytechnic University (HK)
  • University of Manchester (GB)
  • Sichuan University (CN)
Corresponding author
Hu, Jinlian
Venue
Soft Matter
Published
2012
Volume
8
Issue
8
Pages
2509
ISSN
  • 1744-683X (ISSN-L)
  • 1744-6848
OpenAlex
W2018112977
Cited by
208
References
57
Citations by year
2026: 3 · 2025: 10 · 2024: 2 · 2023: 13 · 2022: 10 · 2021: 13 · 2020: 13 · 2019: 26 · 2018: 18 · 2017: 15 · 2016: 22 · 2015: 13 · 2014: 22 · 2013: 22 · 2012: 6
FWCI
30.80
Type
journal article
Language
en
Open access
closed
Locations
  • Soft Matter (publishedVersion)
  • PolyU Institutional Research Archive (Hong Kong Polytechnic University) (submittedVersion)
  • Research Explorer (The University of Manchester) (submittedVersion)
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 › Biomaterials › Advanced Cellulose Research Studies
Keywords
shape memory effect, thermoplastic polyurethane, rubber nanocomposites, percolation network, entropic elasticity, wetting-drying cycles

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