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Related Experiment Video

Updated: May 5, 2026

Bioinspired Soft Robot with Incorporated Microelectrodes
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Biomimetic Intelligent Polymer with Synchronous Color and Shape Responses and Its Application in Soft Robots and

Yun Cong Luo1, Gui Qing Dang1, Heng Hui Tang1

  • 1College of Textile Science and Engineering, Wuyi University, Jiangmen 529020, Guangdong, China.

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|September 2, 2025
PubMed
Summary

Inspired by mimic octopuses, scientists developed a shape-color changing polyurethane (PU). This smart material exhibits reversible shape memory effect and thermochromism, enabling applications in soft robotics and smart textiles.

Keywords:
bilayer compositesreversible shape memory polymerssoft actuatorsspiropyranthermochromism

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomimetic Engineering

Background:

  • Mimic octopuses change shape and color to avoid predators.
  • Developing materials that mimic these adaptive capabilities is of significant interest.

Purpose of the Study:

  • To design a dual-responsive polyurethane (PU) that mimics the shape- and color-changing abilities of mimic octopuses.
  • To create a material with a reversible shape memory effect (SME) and synchronous thermochromism.

Main Methods:

  • Synthesized a polyurethane using crystalline polycaprolactone (PCL) as the soft segment and merocyanine diol (MC(OH)2) as a chain extender.
  • Incorporated uniformly distributed hydrogen bonds as an internal stress provider for shape recovery.
  • Investigated the synergistic effects of PCL switching phase and hydrogen bonds for SME and thermochromism.

Main Results:

  • The developed PU demonstrated a reversible shape memory effect with an average reversible strain of 10.98%.
  • The material exhibited reversible and stepless color change (light pink to dark purple) across a wide temperature range due to dynamic hydrogen bond reversibility.
  • A bilayer PU/paper composite showed reversible bending, suitable for soft actuators.

Conclusions:

  • The study presents a facile strategy for creating mimic-octopus-inspired polymers with dual shape and color responsiveness.
  • The material's properties enable applications in soft actuators, smart textiles, and advanced printing technologies.