Publications by authors named "Shunsuke Murayama"

Article Synopsis
  • The study explored how different ionic groups in ethylene-based ionomers affect their behavior when heated, focusing on carboxylic acid groups neutralized by Zn and Na ions.
  • Differential scanning calorimetry (DSC) showed two endothermic peaks during heating, with the best melting enthalpy occurring at specific Na/Zn ratios, indicating optimal crystallite growth with both ions.
  • X-ray scattering techniques revealed temperature-dependent phase transitions of the crystals, and expansions of ionic aggregates were linked to the melting of polyethylene crystals, highlighting the relationship between ionic composition, microstructure, and thermal properties.
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  • * Two innovative approaches were designed using elastomer nanocomposites with movable cross-links and a carbon filler (ketjenblack) to enhance these properties.
  • * The resulting composites demonstrated stable electrical resistance changes with tensile strain, making them effective and reliable stress-strain sensors for various electronic applications.
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Article Synopsis
  • Researchers have developed unique gas sensors inspired by the structure of leaves, particularly their stomata, which use acetylated cyclodextrin derivatives for electric output.
  • The gas sensors are made from a combination of polymers, including acetylated cyclodextrin and carbon black, allowing them to effectively detect gases like ammonia at low concentrations.
  • The study also shows that molecular dynamics simulations were used to understand how these sensors work, with the free acetylated cyclodextrin playing a crucial role in recognizing and detecting gas molecules.
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The host-guest interaction as noncovalent bonds can make polymeric materials tough and flexible based on the reversibility property, which is a promising approach to extend the lifetime of polymeric materials. Supramolecular materials with cyclodextrin and adamantane are prepared by mixing host polymers and guest polymers by planetary ball milling. The toughness of the supramolecular materials prepared by ball milling is approximately 2 to 5 times higher than that of supramolecular materials prepared by casting, which is the conventional method.

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