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Bacterial cellulose reinforced double-network hydrogels for shape memory strand.

Jiachuan Hua1, Chang Liu1, Pui Fai Ng1

  • 1Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hong Kong, China.

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Summary

Super-tough polyacrylamide/iota-carrageenan hydrogels with bacterial cellulose were developed for advanced applications. These materials exhibit remarkable strength, high toughness, and water-stimulated shape memory for smart textiles and actuators.

Keywords:
Bacterial celluloseDouble-network hydrogelShape memoryStrengtheningTopological interlock

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Area of Science:

  • Materials Science
  • Polymer Chemistry

Background:

  • Tough hydrogels with shape memory are crucial for actuators and smart materials.
  • Developing materials with enhanced mechanical properties and stimuli-responsive behavior is an ongoing challenge.

Purpose of the Study:

  • To synthesize super-tough polyacrylamide/iota-carrageenan double-network hydrogels.
  • To enhance hydrogel properties using bacterial cellulose microclusters.
  • To investigate the shape memory behavior of the fabricated hydrogel strands.

Main Methods:

  • One-pot radical polymerization of polyacrylamide/iota-carrageenan.
  • Incorporation of bacterial cellulose microclusters for reinforcement.
  • Tension-drying and post-annealing treatments to create dry strands.

Main Results:

  • Hydrogels exhibited tensile stress over 200 kPa and toughness of ~2000 kJ/m³.
  • Dry strands withstood over 100 MPa tensile stress.
  • Water-stimulated shape memory recovery ratio of 84.3% in 4 minutes.

Conclusions:

  • The developed hydrogels demonstrate exceptional toughness and shape memory properties.
  • Bacterial cellulose incorporation significantly enhances mechanical strength.
  • These super-tough hydrogels show potential for smart textiles and actuator applications.