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Related Concept Videos

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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Bioinspired elastomer composites with programmed mechanical and electrical anisotropies.

Yun Ling1, Wenbo Pang2,3, Jianxing Liu2,3

  • 1Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, MO, 65211, USA.

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|January 27, 2022
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Summary

Researchers developed bioinspired soft elastomer composites with programmed mechanical and electrical anisotropies. These materials mimic biological tissues and offer potential for advanced artificial muscles and soft robots.

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Area of Science:

  • Materials Science
  • Bioinspired Engineering
  • Soft Robotics

Background:

  • Soft biological tissues, like muscles, exhibit directional mechanical and electrical properties (anisotropies).
  • Replicating these tissue-like anisotropies in synthetic materials is a significant challenge for advanced applications.
  • Existing artificial materials often lack the complex anisotropic behaviors found in nature.

Purpose of the Study:

  • To present bioinspired concepts for creating soft elastomer composites with programmed mechanical and electrical anisotropies.
  • To demonstrate design principles, numerical modeling, and experimental validation of these anisotropic materials.
  • To integrate active functionalities for mimicking biological tissue behaviors.

Main Methods:

  • Utilizing mechanically assembled 3D polyimide structures as skeletons for anisotropic mechanical properties.
  • Employing crumpled conductive surfaces to achieve anisotropic electrical properties.
  • Conducting finite element analyses to model and understand mechanical anisotropies.
  • Incorporating thermally responsive polycaprolactone skeletons for adaptive mechanical behaviors.

Main Results:

  • Successfully fabricated soft elastomer composites with programmed mechanical and electrical anisotropies.
  • Finite element analysis accurately captured key factors governing mechanical anisotropies.
  • Demonstrated adaptive mechanical behavior mimicking muscle relaxation and contraction using thermally responsive skeletons.
  • Fabrication process is compatible with dielectric elastomer actuators.

Conclusions:

  • Developed a novel approach to create anisotropic soft elastomer composites inspired by biological tissues.
  • The engineered materials show promise for bioelectronic devices, artificial muscles, and soft robots.
  • Numerical modeling provides a valuable tool for designing materials with specific anisotropic properties.