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Related Concept Videos

Poisson's Ratio01:23

Poisson's Ratio

444
Poisson's ratio is a material property that indicates their stress response. It explains the connection between the elongation or compression a material undergoes in the direction of an applied force and the contraction or expansion it experiences perpendicular to that force. When a slender bar is loaded axially, it stretches in the direction of the force and contracts laterally. Poisson's ratio is the negative ratio of this lateral contraction to the axial elongation. The negative sign...
444
Plastic Behavior01:21

Plastic Behavior

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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
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Deformation-Induced Photoprogrammable Pattern of Polyurethane Elastomers Based on Poisson Effect.

Shuzhen Yan1, Xinlu Deng2, Shuai Chen1

  • 1School of Chemistry & Chemical Engineering, Frontiers Science Center for Transformative Molecules, State Key Laboratory for Metal Matrix Composite Materials, Shanghai Jiao Tong University, Shanghai, 200240, China.

Advanced Materials (Deerfield Beach, Fla.)
|November 6, 2023
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Summary

Researchers developed a new method to create high aspect ratio surface patterns on polyurethane elastomers using gradient photocrosslinking and the Poisson effect. This technique allows for tunable patterns and structural color, useful for soft machines and smart devices.

Keywords:
Poisson effectdynamic regulationgradient photocrosslinkingpatterningstructural color

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Soft Robotics

Background:

  • Elastomers with high aspect ratio surface patterns are key for advanced soft machines.
  • Fabricating precise and tunable surface patterns on elastomers remains a challenge.

Purpose of the Study:

  • To demonstrate a facile method for fabricating high aspect ratio surface patterns on polyurethane elastomers.
  • To explore the manipulation of pattern aspect ratio via Poisson effect and gradient photocrosslinking.
  • To investigate the potential applications of these patterned elastomers.

Main Methods:

  • Utilizing gradient photocrosslinking via selective photodimerization of anthracene-functionalized polyurethane elastomer (ANPU).
  • Applying uniaxial tensile strains to manipulate pattern aspect ratio.
  • Employing finite element analysis to understand stress distribution and polymer chain migration.
  • Characterizing tunable structural color and reversibility of the patterns.

Main Results:

  • Successfully fabricated high aspect ratio surface patterns on ANPU elastomers.
  • Demonstrated tunable pattern aspect ratio by controlling stretching and gradient crosslinking.
  • Observed reversible structural color changes with varying strain.
  • Finite element analysis confirmed stress regulation and polymer chain migration leading to pattern formation.

Conclusions:

  • The developed method offers a novel approach for creating tunable, high aspect ratio surface patterns on elastomers.
  • The patterned elastomers exhibit reversible structural color, suitable for smart displays and anticounterfeiting.
  • This technique holds promise for applications in stretchable strain sensors and advanced soft machines.