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pH Responsive Strong Polyion Complex Shape Memory Hydrogel with Spontaneous Shape Changing and Information

Qiqian Hu1, Yuancheng Zhang1,2, Tao Wang1,3

  • 1Research Institute of Materials Science, South China University of Technology, Guangzhou, 510640, China.

Macromolecular Rapid Communications
|March 1, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a novel polyion complex (PIC) hydrogel with enhanced stability and multifunctional properties. The new material exhibits pH-responsive shape memory and information encryption capabilities, expanding the potential of PIC hydrogels.

Keywords:
information encryptionpH responsive hydrogelspolyion complex hydrogelsshape memory effectsspontaneous shape changing

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Smart Materials

Background:

  • Polyion complex (PIC) hydrogels offer a defined network and mechanical strength but suffer from poor stability in salt solutions due to counter-ion screening.
  • Exploring novel functions and improving the stability of PIC hydrogels are crucial for broader applications.

Purpose of the Study:

  • To develop a multifunctional PIC hydrogel with enhanced stability and novel responsive behaviors.
  • To investigate the impact of hydrophobic weak electrolytes on PIC hydrogel properties and explore new applications.

Main Methods:

  • Synthesized a PIC hydrogel by polymerizing 2-(diethylamino)ethyl methacrylate in poly(styrene sulfonic acid) aqueous solution with NaCl.
  • Characterized the hydrogel using Fourier transform infrared (FTIR) spectroscopy, water content analysis, and mechanical property testing.
  • Evaluated the hydrogel's response to varying salt concentrations and pH levels.

Main Results:

  • The hydrophobic monomer introduction resulted in stable mechanical strength even in high-concentration NaCl solutions.
  • The hydrogel displayed pH-modulated softening and strengthening, with unique swelling/shrinking and strengthening/softening behaviors in acidic and alkaline conditions, respectively.
  • Demonstrated pH-induced shape memory, spontaneous shape changing, and information encryption through transmittance and water absorption variations.

Conclusions:

  • The developed PIC hydrogel exhibits remarkable stability in salt solutions and unique pH-responsive properties, including shape memory and information encryption.
  • This novel hydrogel serves as a promising smart material for applications in soft robotics and secure information transformation.