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Related Experiment Video

Updated: Nov 20, 2025

Synthesis of Hydrogels with Antifouling Properties As Membranes for Water Purification
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High-Performance Photochromic Hydrogels for Rewritable Information Record.

Shijun Long1, Zhihua Ye1, Yiqi Jin1

  • 1Hubei Provincial Key Laboratory of Green Materials for Light Industry, School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan, 430068, P. R. China.

Macromolecular Rapid Communications
|January 25, 2021
PubMed
Summary

This study introduces a novel photochromic hydrogel with exceptional mechanical strength, enabling repeatable optical information writing. The material combines reversible color changes with robust mechanical properties for advanced applications.

Keywords:
information recordsion-hybrid crosslinkmechanical propertiesphotochromic hydrogels

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Optoelectronics

Background:

  • Rewritable information record materials require stimuli-responsive and robust mechanical properties.
  • Existing materials often lack the combination of photochromic behavior and high mechanical strength.
  • Developing advanced hydrogels for information storage is an ongoing challenge.

Purpose of the Study:

  • To engineer a photochromic hydrogel with super-strong mechanical properties.
  • To achieve reversible optical information writing capabilities.
  • To explore applications in optical displays and data storage.

Main Methods:

  • Incorporation of hydrophobic spiropyran (SP) molecules into an ion-hybrid crosslinked copolymer.
  • Utilizing Ca2+ as crosslinking ions to enhance mechanical and photoresponsive properties.
  • Investigating UV-light induced ionic interaction coordination for property enhancement.

Main Results:

  • The synthesized hydrogels exhibit photoinduced reversible color changes.
  • Achieved excellent mechanical properties: tensile stress of 3.22 MPa, work of tension of 12.8 MJ m-3, and modulus of elasticity of 8.6 MPa.
  • Demonstrated enhanced properties via UV-light exposure through ionic coordination.

Conclusions:

  • The novel SP-based Ca2+ crosslinked hydrogels offer a unique combination of photochromism and super-strong mechanical performance.
  • The material exhibits excellent reversible conversion, suitable for repeatable optical information writing.
  • This design holds significant potential for applications in optical information storage, displays, AI, and flexible electronics.