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The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
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Fully Elastic Conductive Films from Viscoelastic Composites.

Sunghwan Cho1, Jun Hyuk Song1, Minsik Kong2

  • 1Department of Materials Science and Engineering, Yonsei University , 50, Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea.

ACS Applied Materials & Interfaces
|November 29, 2017
PubMed
Summary

Researchers developed a highly conductive, stretchable thermoplastic composite using gold nanosheets and a block copolymer. This material demonstrates complete elastic recovery at high strains, enabling robust, stretchable electrodes for advanced applications.

Keywords:
Au nanosheetsSBS block copolymercomposite filmstretchable electrochemiluminescence displaysstretchable electrodestretchable electronicsthermoplastic polymer

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Developing stretchable conductive materials is crucial for flexible electronics.
  • Thermoplastic composites offer processing advantages but often lack high stretchability.
  • Achieving reversible elasticity at high strains in conductive composites remains a challenge.

Purpose of the Study:

  • To investigate conditions for achieving completely reversible stretchability in thermoplastic conductive composites.
  • To explore the potential of gold (Au) nanosheet/block copolymer composites for stretchable electronics.
  • To demonstrate the fabrication of stretchable electrochemiluminescence displays.

Main Methods:

  • Fabrication of a composite using Au nanosheets and polystyrene-block-polybutadiene-block-polystyrene.
  • Investigating the composite's mechanical and electrical properties under high strain.
  • Layering the thermoplastic composite onto a chemically cross-linked elastomer substrate.
  • Characterizing the microstructure restoration and adhesion properties.

Main Results:

  • The composite exhibited reversible stretchability up to ε = 1.8.
  • Achieved outstandingly low sheet resistance of 0.45 Ω/sq.
  • Demonstrated that layering on an elastomer substrate enables elastic recovery via microstructure restoration.
  • Showcased mechanically robust, highly conductive, stretchable electrodes.

Conclusions:

  • Thermoplastic conductive composites can achieve high reversible stretchability when supported by elastomers.
  • The strong polymer-metal adhesion is key for robust and conductive stretchable electrodes.
  • The developed composite is suitable for fabricating high-luminescence, stretchable electrochemiluminescence displays.