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Showing 1–4 of 4 results
Advanced filters: Author: Tsukuru Masuda Clear advanced filters

  • We prepared the chemically crosslinked, cylindrical thermoresponsive poly(N-isopropylacrylamide) gels with changing the contents of reversible addition-fragmentation chain transfer (RAFT) agent. The environment in the gel was estimated by using a hydrophobic fluorescence probe. While the equilibrium swelling ratios were comparable, the deswelling response became fast as the content of RAFT agent increased with the formation of “bubble pattern”. This result indicates that the PNIPAAm gels prepared by RAFT still have spatial defects. In addition, the cooperative diffusion coefficients in swelling process of the gels prepared by RAFT polymerization were estimated.

    • Tsukuru Masuda
    • Madoka Takai
    Research
    Polymer Journal
    Volume: 52, P: 1407-1412

  • Soft interfaces formed by polymer materials are important interfaces for biological systems (biointerfaces). Controlled radical polymerization (CRP) is highly suited for designing biointerfaces composed of polymer chains because it enables precise control of the polymer architecture at the nanoscale. This focus review describes the design of functional soft interfaces based on investigations of the structure-property relationships of CRPs. In particular, polymer brush surfaces showing autonomous property changes, comb-type copolymer-driven 2D/3D transformations of lipid bilayers, and molecular interactions in bactericidal cationic polymer brushes are depicted.

    • Tsukuru Masuda
    ReviewsOpen Access
    Polymer Journal
    Volume: 56, P: 643-652

  • In this study, a deformable and adhesive biocompatible hydrogel composed of 2-methacryloyloxyethyl phosphorylcholine (MPC) with a chemical crosslinker [N,N′-methylenebisacrylamide] was synthesized using a cationic radical initiator, 2,2′-azobis-[2-(1,3-dimethyl- 4,5-dihydro-1H-imidazol-3-ium-2-yl)]propane triflate (ADIP). The adhesive PMPC gel was tolerant to peeling during adhesion. Furthermore, the formation mechanism underlying the synthesis of deformable and adhesive hydrogels was determined by analyzing the polymerization behavior. The polymer synthesized with ADIP had a lower molecular weight than that synthesized with a conventional redox-type initiator, ammonium persulfate/N,N,N′,N′-tetamethylethylenediamine. Moreover, the appropriate combination of monomers and crosslinkers required to generate the target hydrogel was determined

    • Tsukuru Masuda
    • Yui Saegusa
    • Madoka Takai
    ResearchOpen Access
    Polymer Journal
    Volume: 57, P: 1257-1268