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Related Experiment Video

Updated: Jul 7, 2026

A Tactile Automated Passive-Finger Stimulator TAPS
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Programmable and Shape-Color Synchronous Dual-Response Wood with Thermal Stimulus.

Yi Tan1, Kaili Wang2, Youming Dong2

  • 1State Key Laboratory of Efficient Production of Forest Resources, MOE Key Laboratory of Wood Material Science and Application, Beijing Key Laboratory of Wood Science and Engineering, Beijing Forestry University, Beijing 100083, China.

ACS Nano
|January 26, 2024
PubMed
Summary

This study introduces a novel wood composite that changes shape and color in response to temperature. This stimuli-responsive material offers programmable shape memory and dual-responsiveness for advanced applications.

Keywords:
dynamic covalent vitrimersshape memoryshape programmingshape-color synchronous dual-responsivenesswood

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biocomposites

Background:

  • Stimuli-responsive materials are crucial for sensors and electronics but face challenges in reinforcement, visualization, and biomass integration.
  • Dynamic covalent vitrimers offer adaptable networks, while thermochromic microcapsules provide visual response capabilities.

Purpose of the Study:

  • To develop a programmable shape-color dual-responsive wood composite (SRW-TC) by incorporating thermochromic microcapsules (TCM) into dynamic covalent vitrimers.
  • To investigate the material's shape memory, programmability, and dual-responsive characteristics.
  • To evaluate its potential for applications in sensing, actuation, and information encryption.

Main Methods:

  • Impregnation of thermochromic microcapsule (TCM)-doped dynamic covalent vitrimers into wood structures.
  • Characterization of glass-transition temperature (34.99 °C) and topology freezing transition temperature (149.62 °C) to understand responsiveness.
  • Evaluation of mechanical, thermal, and optical properties, including tensile strength, thermal conductivity, transmittance, and haze.

Main Results:

  • The SRW-TC exhibits programmable shape memory and rigidity-flexibility switching triggered by temperature changes.
  • The material demonstrates satisfactory mechanical strength (45.70 MPa), thermal insulation (0.27 W/m K), and anisotropic light management.
  • Synchronous shape and color changes in response to thermal stimuli were observed, enabling visualization of material state and function.

Conclusions:

  • The developed SRW-TC offers a facile strategy for creating multifunctional wood composites with intelligent applications.
  • The material's dual-responsiveness and programmable nature open avenues for environmental sensing, interactive materials, and information dual-encryption.
  • This approach provides a guideline for designing advanced wood-based materials with enhanced performance and visual feedback.