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A functional eutectogel based on ultrahigh-molecular weight polymers: Physical entanglements in deep eutectic

Trung Hieu Vo1, Phuc Khanh Lam1, Yu-Jane Sheng2

  • 1Department of Chemical and Materials Engineering, National Central University, Taoyuan 32001, Taiwan; Department of Chemistry, National Central University, Taoyuan 32001, Taiwan.

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Researchers developed a novel entangled eutectogel using polyvinylpyrrolidone (PVP) and a deep eutectic solvent. This material offers superior stretchability, toughness, and self-healing properties for advanced wearable devices.

Keywords:
Deep eutectic solventEntanglementEutectogelUltrahigh–molecular weight polymer

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Electrochemistry

Background:

  • Eutectogels are promising for wearable devices due to ionic conductivity and low cost.
  • Limited polymers and gelling methods hinder eutectogel development.
  • Developing new fabrication strategies is crucial for advancing eutectogel applications.

Purpose of the Study:

  • To create a novel entangled eutectogel using a simple fabrication method.
  • To investigate the potential of polymer chain entanglements in eutectogel design.
  • To evaluate the performance of the developed eutectogel for wearable applications.

Main Methods:

  • Fabrication of an entangled eutectogel via heating-cooling dissolution of ultra-high molecular weight polyvinylpyrrolidone (PVP) in a deep eutectic solvent (reline).
  • Characterization of the eutectogel's mechanical properties (stretchability, toughness) and ionic conductivity.
  • Assessment of its suitability for strain-sensing applications and investigation of self-healing capabilities.

Main Results:

  • The eutectogel (40 wt% PVP) demonstrated high stretchability (1410% strain) and toughness (544.8 kJ/m³).
  • Achieved ionic conductivity of 0.015 S/m, suitable for wearable electronics.
  • Exhibited reliable resistance signal generation for strain sensing and demonstrated self-healing properties.

Conclusions:

  • A facile method for fabricating entangled eutectogels based on polymer chain entanglements was successfully developed.
  • The study highlights the significant role of long chain entanglements in enhancing eutectogel properties.
  • This work paves the way for advanced, self-healing wearable devices utilizing novel eutectogel formulations.