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Showing 1–6 of 6 results
Advanced filters: Author: Youngho Eom Clear advanced filters

  • Self-healing materials strive to emulate curable and resilient biological tissue but their performance is often insufficient for commercial applications because self-healing and toughening are mutually exclusive properties. Here, the authors report a tough and strong carbonate-type thermoplastic polyurethane elastomer that self-heals at ambient temperature.

    • Youngho Eom
    • Seon-Mi Kim
    • Dongyeop X. Oh
    ResearchOpen Access
    Nature Communications
    Volume: 12, P: 1-11

  • Biological tissues are extremely water rich but remain mechanically stiff, behaviour that is difficult to recapitulate in synthetic materials. Here the authors design a hydrogel/sponge hybrid material driven by a self-organized network of cyano-p-aramid nanofibres that combines these properties for biofunctional materials.

    • Minkyung Lee
    • Hojung Kwak
    • Dongyeop X. Oh
    Research
    Nature Materials
    Volume: 23, P: 414-423

  • The applicability of mechanochromic fibres is limited by their poor mechanochromic properties, mechanical strength, or elasticity. Here, the authors develop cholesteric liquid crystal elastomers fibres with a commercial-grade thermoplastic elastomer core and a cholesteric liquid crystal elastomer with enhanced mechanical properties.”

    • Yu Jin Jeong
    • Youngeun Lee
    • Dae Seok Kim
    ResearchOpen Access
    Nature Communications
    Volume: 16, P: 1-10

  • The crystallization behavior of the ethylene, propylene and carbon monoxide/thermoplastic elastomer (EPCO/HY) blends in the static and dynamic states revealed that immiscible HY retarded the crystallization of EPCO without changing its crystal structure. The large difference in the elastic moduli of the two polymers at the crystallization temperature was the principal reason for the retardation process. The retardation of crystallization could be explained by steric hindrance or a shield effect of the HY phase on the growth of EPCO spherulites at a temperature near the crystallization temperature (Tc).

    • Youngho Eom
    • Jeongsik Bae
    • Byoung Chul Kim
    Research
    Polymer Journal
    Volume: 47, P: 493-497

  • The liquid crystalline (LC) behavior of two lyotropic systems, poly(p-phenylene terephthalamide) solutions in sulfuric acid and hydroxypropyl cellulose (HPC) solutions in water, was compared on a dynamic rheological basis. Two systems showed similar behaviors in molecular stress relaxation but different orientation relaxation time behaviors. The helicoidal structure of the HPC systems is transformed to a nematic-like directional order via the damping process under very high shear.

    • Youngho Eom
    • Dae Eon Jung
    • Byoung Chul Kim
    Research
    Polymer Journal
    Volume: 48, P: 869-874