Cited by 371Supramolecular Chemistry and ComplexesPolymer composites and self-healingSupramolecular Self-Assembly in Materials

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Photoswitching topology in polymer networks with metal–organic cages as crosslinks

Gu, Yuwei, Alt, Eric A., Wang, Heng, Li, Xiaopeng, Willard, Adam P., Johnson, Jeremiah A.·2018·Nature

DOI 10.1038/s41586-018-0339-0

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Abstract

Polymer networks can have a range of desirable properties such as mechanical strength, wide compositional diversity between different materials, permanent porosity, convenient processability and broad solvent compatibility 1,2. Designing polymer networks from the bottom up with new structural motifs and chemical compositions can be used to impart dynamic features such as malleability or self-healing, or to allow the material to respond to environmental stimuli 3-8. However, many existing systems exhibit only one operational state that is defined by the material's composition and topology 3-6; or their responsiveness may be irreversible 7,9,10 and limited to a single network property 11,12 (such as stiffness). Here we use cooperative self-assembly as a design principle to prepare a material that can be switched between two topological states. By using networks of polymer-linked metal-organic cages in which the cages change shape and size on irradiation, we can reversibly switch the network topology with ultraviolet or green light. This photoswitching produces coherent changes in several network properties at once, including branch functionality, junction fluctuations, defect tolerance, shear modulus, stress-relaxation behaviour and self-healing. Topology-switching materials could prove useful in fields such as soft robotics and photo-actuators as well as providing model systems for fundamental polymer physics studies.

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Authors: Gu, Y., Alt, E. A., Wang, H., Li, X., Willard, A. P., & Johnson, J. A.
Affiliations: Massachusetts Institute of Technology (US)
University of South Florida (US)
Corresponding author: Johnson, Jeremiah A.
ORCID: Gu, Yuwei
Wang, Heng
Li, Xiaopeng
Willard, Adam P.
Johnson, Jeremiah A.
Venue: Nature
Publisher: Springer Science and Business Media LLC
Published: 2018-07-18
Volume: 560
Issue: 7716
Pages: 65-69
ISSN: 0028-0836 (ISSN-L)
1476-4687
DOI: 10.1038/s41586-018-0339-0
OpenAlex: W2884331733
Cited by: 371
References: 32
Citations by year: 2026: 23 · 2025: 46 · 2024: 45 · 2023: 48 · 2022: 56 · 2021: 54 · 2020: 43 · 2019: 48 · 2018: 8
FWCI: 15.67
Type: journal article
Language: en
Update notices: correction (2018-08-20)
Open access: closed
Licence: www.springer.com/tdm (tdm)
Locations: Nature (publishedVersion)
PubMed (publishedVersion)
RePEc: Research Papers in Economics (submittedVersion)
Topics: Physical Sciences › Chemistry › Organic Chemistry › Supramolecular Chemistry and Complexes
Physical Sciences › Materials Science › Polymers and Plastics › Polymer composites and self-healing
Physical Sciences › Materials Science › Biomaterials › Supramolecular Self-Assembly in Materials
Keywords: photoswitching, polymer networks, metal-organic cages, crosslinking, switching topologies, cooperative self-assembly, photoresponsive gels, self-healing, stress relaxation, shear modulus, defect tolerance, soft robotics

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Photoswitching topology in polymer networks with metal–organic cages as crosslinks

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