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Classification and Mechanical Properties of Synthetic Polymers01:28

Classification and Mechanical Properties of Synthetic Polymers

Synthetic polymers are classified as elastomers, fibers, or plastics based on their crystallinity. Crystallinity, the degree of long-range order in the solid state, influences the mechanical properties (stretching or contracting) of elastomers. Elastomers are flexible polymers that can expand or contract easily upon the application of an external force. They have numerous crosslinks that pull them back into their original shape when stress is removed. Silicones, for instance, are highly elastic...

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Polyurethane Elastomers with Mechanochromic and Self-Healing Functions for Strain Sensor.

Zemei Hu1, Yue Li1, Xiaoqiong Hao1

  • 1School of Textile Science and Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi, China.

Macromolecular Rapid Communications
|August 29, 2025
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Summary

Researchers developed a smart polyurethane that self-heals and changes color when damaged. This material uses dynamic covalent bonds for low-temperature repair and visual stress indication, offering a simple method for damage detection in polyurethanes.

Keywords:
mechanochromic materialpolyurethane elastomersself‐healing functionstrain sensor

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Smart Materials

Background:

  • Polyurethanes offer excellent processability and mechanical properties but are susceptible to micro-damage, leading to performance failure.
  • Current non-destructive damage assessment methods for polyurethanes are often complex and expensive.
  • Self-healing and mechanochromic properties are desirable for enhancing polyurethane durability and enabling simple damage detection.

Purpose of the Study:

  • To develop a smart polyurethane material integrating both self-healing and mechanochromic functionalities.
  • To create a simple, visual method for detecting micro-damage and monitoring stress in polyurethane materials.
  • To improve the service life and reliability of polyurethane components through advanced material design.

Main Methods:

  • Synthesis of a novel polyurethane material incorporating dynamic Schiff base covalent bonds.
  • Incorporation of mechanochromic properties triggered by molecular chain orientation changes.
  • Evaluation of self-healing efficiency at low temperatures and reversible color switching under external stimulation.

Main Results:

  • The prepared polyurethane demonstrated efficient self-healing capabilities at low temperatures.
  • The material exhibited reversible color switching due to π-π* stacking reconstruction upon external stimulation.
  • The mechanochromic response allows for direct visualization of material damage and dynamic stress processes.

Conclusions:

  • A multifunctional smart polyurethane combining self-healing and mechanochromic properties was successfully developed.
  • The dynamic Schiff base covalent bonds facilitate effective low-temperature self-healing.
  • This material offers a promising platform for developing advanced flexible sensors and improving the longevity of polyurethane applications.