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Highly Bidirectional Bendable Actuator Engineered by LCST-UCST Bilayer Hydrogel with Enhanced Interface.

Jian Li1, Qiyue Ma1, Yue Xu1

  • 1Key Laboratory of Functional Polymer Materials of the Ministry of Education and College of Chemistry, Nankai University, Tianjin 300071, P. R. China.

ACS Applied Materials & Interfaces
|November 24, 2020
PubMed
Summary

This study introduces a novel bilayer hydrogel actuator using complementary polymers for rapid, large-angle temperature-driven bending. The advanced actuator demonstrates potential for artificial intelligence materials and applications like grippers and switches.

Keywords:
LCST polymerUCST polymeractuatorsbilayer hydrogelthermoresponsive

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Thermoresponsive hydrogel actuators are crucial for research and industry.
  • Current actuators face challenges in rapid response, bending range, and recovery time.
  • Existing designs often rely on single polymers with either LCST or UCST, limiting performance.

Purpose of the Study:

  • To design and synthesize a fully temperature-driven bilayer hydrogel actuator with enhanced performance.
  • To overcome limitations of existing actuators regarding response speed, bending angle, and recovery.
  • To explore the potential of complementary UCST and LCST polymers for advanced actuator design.

Main Methods:

  • Synthesized a bilayer hydrogel actuator combining poly(N-acryloyl glycinamide) (NAGA) with UCST behavior and a poly(N-isopropyl acrylamide) (NIPAM)-Laponite nanocomposite with LCST behavior.
  • Utilized the complementary thermoresponsive swelling and shrinkage properties of the two layers.
  • Incorporated Laponite nanosheets into the PNIPAM layer to enhance mechanical properties and interfacial adhesion.

Main Results:

  • Achieved rapid thermoresponsive bending and recovery due to the opposing volume phase transitions of NAGA and PNIPAM-Laponite.
  • Demonstrated a large bending angle, surpassing conventional designs.
  • Verified improved mechanical properties and excellent interfacial bonding, preventing delamination.
  • Showcased actuator functionality as a gripper and an electrical circuit switch for an LED.

Conclusions:

  • The developed bilayer hydrogel actuator offers rapid, large-angle, and reversible temperature-driven actuation.
  • The combination of complementary UCST and LCST polymers, along with Laponite reinforcement, is a promising strategy for high-performance actuators.
  • This work provides new insights for designing and fabricating advanced materials for artificial intelligence applications.