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Rapid Manufacturing of Thin Soft Pneumatic Actuators and Robots
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Stiffness Variable Polymer for Soft Actuators with Sharp Stiffness Switch and Fast Response.

Yahao Liu1,2, Yuansheng Wang1, Xue Yang3

  • 1College of Naval Architecture and Ocean Engineering, Naval University of Engineering, Wuhan 430022, China.

ACS Applied Materials & Interfaces
|May 18, 2023
PubMed
Summary

Researchers developed novel variable stiffness polymers for soft actuators. These materials offer a wide stiffness range and rapid changes, enabling advanced robotic applications.

Keywords:
Joule heatingphase changingshape memorysoft actuatorvariable stiffness

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Robotics

Background:

  • Stiffness variable polymers are crucial for soft actuators, but achieving a wide stiffness range and fast response remains challenging.
  • Existing methods struggle to meet the demands for high-performance soft robotic applications.

Purpose of the Study:

  • To synthesize and optimize variable stiffness polymers with a broad stiffness range and rapid transition capabilities.
  • To integrate these polymers into 3D printed soft actuators for enhanced performance.

Main Methods:

  • Synthesis of variable stiffness polymers with optimized formulas using Pearson correlation tests.
  • Characterization of material properties including stiffness ratio, thermal behavior (narrow endothermic peak), and shape memory properties (shape fixity and recovery).
  • Integration into 3D printed soft actuators and evaluation of actuation performance, heating-cooling cycles, and load-lifting capacity.

Main Results:

  • Achieved a rigid/soft stiffness ratio of up to 1376-folds.
  • Demonstrated narrow endothermic peaks (FWHM < 5 °C) due to phase-changing side chains.
  • Obtained high shape fixity (99.3%) and shape recovery (99.2%) ratios.
  • Developed a soft actuator capable of lifting 200 g with a stiffness up to 718 mN/mm and rapid heating-cooling cycles (19 s).

Conclusions:

  • Successfully synthesized advanced variable stiffness polymers suitable for soft actuators.
  • The developed polymers exhibit exceptional stiffness tunability, rapid response, and shape memory effects.
  • The 3D printed soft actuator demonstrates significant potential for applications requiring adaptable stiffness and actuation.