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Biomimetic Multiscale Oriented PVA/NRL Hydrogel Enabled Multistimulus Responsive and Smart Shape Memory Actuator.

Zhaohui Li1, Zewei Li1, Shihao Zhou1

  • 1Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics, Qingdao University of Science & Technology, Shan Dong Sheng, Qing Dao Shi, 266042, China.

Small (Weinheim an Der Bergstrasse, Germany)
|February 1, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a new muscle-inspired hydrogel with enhanced mechanical strength and shape memory properties. The novel material demonstrates high actuation strength and responsiveness, paving the way for advanced biomimetic devices.

Keywords:
biomimetic musclesmultiscale orientationnatural rubber latexpolyvinyl alcoholshape memory hydrogels

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Area of Science:

  • Materials Science
  • Polymer Science
  • Biomaterials Engineering

Background:

  • Shape memory hydrogels are promising for functional soft materials but often suffer from poor mechanical properties and low actuation strength.
  • This limits their application in sophisticated devices like smart biomimetic systems.

Purpose of the Study:

  • To develop a novel shape memory hydrogel with improved mechanical and shape memory characteristics.
  • To create a muscle-inspired material with multiscale oriented structure for enhanced performance.

Main Methods:

  • A strategy was developed using polyvinyl alcohol (PVA) and natural rubber latex (NRL) to create an oriented polyvinyl alcohol-natural rubber latex hydrogel (OPNH).
  • The shape memory function was achieved through stretch-induced crystallization of natural rubber (NR), with PVA enhancing interactions with NRL particles.
  • A multiscale-oriented structure was formed during a stretch-drying process.

Main Results:

  • The OPNH exhibited excellent interfacial compatibility and outstanding mechanical performance (3.2 MPa).
  • High shape fixity (≈80%) and shape recovery ratio (≈92%) were achieved.
  • The hydrogel demonstrated high actuation strength (206 kPa), significant working capacity (105 kJ m⁻³), and rapid response time (≈2 s) at a low temperature (28 °C).

Conclusions:

  • The developed OPNH shows superior mechanical and shape memory properties compared to conventional hydrogels.
  • Its muscle-like working capacity, demonstrated by lifting 372 times its weight, highlights its potential for smart biomimetic muscles.
  • This new class of shape memory material offers significant possibilities for advanced multistimulus responsive devices.