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Related Experiment Video

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Elastomeric Light Emitting Polymer Enhanced by Interpenetrating Networks.

Huier Gao1, Si Chen1,2, Jiajie Liang1

  • 1Department of Materials Science and Engineering, Henry Samuli School of Engineering and Applied Science, University of California, Los Angeles , 420 Westwood Plaza, Los Angeles, California 90095, United States.

ACS Applied Materials & Interfaces
|November 5, 2016
PubMed
Summary
This summary is machine-generated.

This study introduces an interpenetrating polymer network (IPN) approach to create stretchable conjugated polymers. The novel IPN material maintains its properties under high strain, enabling flexible electronic devices.

Keywords:
elastomericinterpenetrating networkslight emitting electrochemical cellmorphologypolymer blendstretchable

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Organic Electronics

Background:

  • Conjugated polymers with alkyl side groups are typically brittle and fracture under strain.
  • Stretching conjugated polymers can reorient chains, leading to high dichroic ratios but often causing irreversible damage.

Purpose of the Study:

  • To develop elastomeric conjugated polymers with improved stretchability.
  • To investigate the potential of an interpenetrating polymer network (IPN) approach for enhancing polymer deformability.
  • To create stretchable light-emitting devices based on these novel materials.

Main Methods:

  • An interpenetrating polymer network (IPN) was formed by admixing a soluble conjugated polymer (SY-PPV) with an ionically conductive medium.
  • The IPN morphology and mechanical properties were characterized using PeakForce quantitative nanomechanical mapping.
  • Light-emitting devices were fabricated using the IPN blend and stretchable electrodes.

Main Results:

  • The IPN morphology featured a porous SY-PPV network filled with a softer ionic phase.
  • The material exhibited high local Young's modulus in the SY-PPV phase and was two times softer in the ionic phase.
  • No global polarization of SY-PPV chains was observed up to 100% strain (dichroic ratio near 1).
  • Devices demonstrated stretchability up to 140% strain without electroluminescence polarization.

Conclusions:

  • The IPN approach successfully imparts elastomeric deformability to conjugated polymers.
  • The developed material is suitable for stretchable electronic applications, maintaining performance under significant strain.
  • The lack of chain polarization and electroluminescence polarization indicates robust mechanical integrity and uniform emission properties.