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Supramolecular Photoresponsive Polyurethane with Movable Crosslinks Based on Photoisomerization of Azobenzene
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  • Xin Zhou,
  • Ryohei Ikura,
  • Changming Jin,
  • Kenji Yamaoka,
  • Junsu Park,
  • Yoshinori Takashima
Xin Zhou
Osaka University School of Science Graduate School of Science
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Ryohei Ikura
Osaka University School of Science Graduate School of Science
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Changming Jin
Osaka University School of Science Graduate School of Science
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Kenji Yamaoka
Osaka University School of Science Graduate School of Science
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Junsu Park
Osaka University School of Science Graduate School of Science
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Yoshinori Takashima
Osaka University

Corresponding Author:[email protected]

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Abstract

Photoresponsive supramolecular materials have been fabricated by controlling the density of reversible cross-links or the distribution of movable cross-links. This study prepared photoresponsive polyurethane (CD-Azo-PU) based on controlling the crystallization of the hard segments in polyurethane (PU) by complexation between azobenzene (Azo) and cyclodextrins (CDs). CD-Azo-PU incorporated polyurethane as the main chain and a 1:2 inclusion complex between Azo and γCD as a movable crosslink point. Upon ultraviolet light (UV, λ = 365 nm) irradiation, the photoresponsiveness of CD-Azo-PU bent toward the light source (defined as positive), while that of the linear Azo polyurethane (Azo-LPU) without TAcγCD-diOH as a movable crosslinker bent in the direction opposite the light source. The bending rates were determined to be 0.058°/s for CD-Azo-PU and 0.027°/s for Azo-LPU, indicating that the bending rate for CD-Azo-PU was faster than that for Azo-LPU. By incorporating movable cross-links into CD-Azo-PU, we successfully achieved specific photoresponsive actuation with an enhanced rate.
24 Aug 2023Submitted to Aggregate
24 Aug 2023Assigned to Editor
24 Aug 2023Submission Checks Completed
24 Aug 2023Reviewer(s) Assigned
04 Sep 2023Review(s) Completed, Editorial Evaluation Pending
05 Sep 2023Editorial Decision: Revise Major
22 Oct 2023Review(s) Completed, Editorial Evaluation Pending
23 Oct 2023Editorial Decision: Accept