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Showing 1–4 of 4 results
Advanced filters: Author: Yohei Kotsuchibashi Clear advanced filters
  • Temperature-responsive (or thermoresponsive) polymers belong to the most studied class of smart polymers and are mainly classified into two types based on their temperature-responsive behavior: lower critical solution temperature (LCST) and upper critical solution temperature (UCST). Based on polymeric design, when more than two temperature-responsive segments are connected through a covalent bond, the block copolymers are expected to show a multi-temperature-responsive property upon conformational changes. This review focuses on current multi-temperature-responsive polymeric materials and their future applications such as drug-delivery carriers, sensors in solvents, model proteins, and memory storage.

    • Yohei Kotsuchibashi
    Reviews
    Polymer Journal
    Volume: 52, P: 681-689
  • Water-insoluble micropatterned films were prepared from poly(vinyl alcohol) (PVA) (or ethylene-vinyl alcohol copolymer (EVOH)) and poly(methacrylic acid) (poly(MAAc)). The carboxy groups in poly(MAAc) underwent dehydration reactions with the hydroxy groups in the vinyl alcohol units during heating at 135 °C, which resulted in the introduction of a crosslinked structure with ester bonds into the polymeric network of the micropatterned films. The micropatterns could be peeled off from the films after decomposition and maintained their patterned shapes.

    • Haruki Uchida
    • Wakako Uchiyama
    • Yohei Kotsuchibashi
    Research
    Polymer Journal
    Volume: 56, P: 677-684
  • Water-insoluble poly(methacrylic acid) (poly(MAAc)) sponges with nanolayered structures were fabricated via thermal cross-linking with poly(vinyl alcohol) (PVA). The cross-linked sponges contained up to 75 wt% poly(MAAc) when the molecular weight of PVA and the cross-linking time were adjusted appropriately. After immersion in a NaClO·5H2O aqueous solution, all poly(MAAc)/PVA_50 wt% sponges with different PVA molecular weights were completely dissolved. Multilayer films of poly(MAAc)/PVA with different physicochemical properties were also fabricated. Among potential applications, these sponges can be used as adsorption materials for low molecular weight compounds and heavy metal ions.

    • Daiki Kobayashi
    • Haruki Uchida
    • Yohei Kotsuchibashi
    Research
    Polymer Journal
    Volume: 55, P: 163-170
  • An ethylene glycol-based hexa-block copolymer with six different temperature-responsive blocks was prepared via a reversible addition-fragmentation chain transfer (RAFT) polymerization. 2-(2-Methoxyethoxy)ethyl methacrylate (MEO2MA) and oligo(ethylene glycol) methacrylate (OEGMA) were selected as the ethylene glycol-based monomers. Each block exhibits a different LCST in aqueous solution owing to their different OEGMA contents.

    • Yoko Kudo
    • Hiromitsu Mori
    • Yohei Kotsuchibashi
    Research
    Polymer Journal
    Volume: 50, P: 1013-1020