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Showing 1–2 of 2 results
Advanced filters: Author: "Atsushi Harada" Clear advanced filters

  • This review focuses on the physicochemical characterization of polyion complex (PIC) micelles, particularly addressing the critical molecular factors to determine the self-assembly scheme of double-hydrophilic block copolymers composed of charged and non-charged segments into micelle structures. The process of PIC micelle formation provides new insights on the block copolymer self-assembly in thermodynamically equilibrium condition in aqueous medium, such as chain length recognition and transition from uPIC, which is the PIC of smallest neutralizing unit, to PIC micelle structures.

    • Atsushi Harada
    • Kazunori Kataoka
    Reviews
    Polymer Journal
    Volume: 50, P: 95-100

  • Reversible complexation mediated polymerization (RCMP) was demonstrated in the presence of an aqueous phase using various amine catalysts and monomers to investigate the effect of hydrophobicity of amine catalysts and monomers on the polymerization control of RCMP in aqueous heterogeneous systems. The essential criteria for polymerization control were (i) sufficient hydrophobicity of initiators and catalysts to enable partitioning into monomer phases, (ii) a suitable I2 concentration and temperature for improving polymerization control using long-alkyl chain amine catalysts, and (iii) sufficient monomer hydrophobicity to suppress water solubilization into monomer phase.

    • Yukiya Kitayama
    • Daiki Tokura
    • Atsushi Harada
    Research
    Polymer Journal
    Volume: 55, P: 1-12