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Showing 1–5 of 5 results
Advanced filters: Author: Yousuke Ooyama Clear advanced filters

  • Photoinduced transitions between the solid, glass, and liquid states based on molecular photoswitches promise an enormous variety of applications, such as photoswitchable adhesives, which contribute to material recycling for a sustainable future in the era of composite materials. In this review, we highlight recent progress in the photoinduced transitions of small molecules and polymers and systematically discuss the molecular designs, mechanisms, applications, merits and demerits, and future challenges in each photoswitch and the whole field.

    • Keiichi Imato
    • Naoki Kaneda
    • Yousuke Ooyama
    ReviewsOpen Access
    Polymer Journal
    Volume: 56, P: 269-282

  • Functional dyes offer fascinating properties in response to external stimuli and enable unique stimuli-responsive functions in materials by chemical incorporation into polymers. In this review, we highlight our recent studies conducted in the last half decade on stimuli-responsive smart polymers and polymeric materials offering, for example, switchable adhesion, mechanical actuation, and chemical sensing based on functional dyes that are chemically incorporated into the structures, with a particular focus on the stimuli of light, force, electric fields, and chemicals including water.

    • Keiichi Imato
    • Yousuke Ooyama
    ReviewsOpen Access
    Polymer Journal
    Volume: 56, P: 1093-1109

  • Donor–acceptor (D–A)-type alternate polymers were synthesized, with either dithienyldithienosilole or dithienosilole as the donor and pyridine as the acceptor, and they exhibited broad absorption peaks at approximately 520 nm. Complex formation of the polymers with B(C6F5)3 was examined, revealing even broader absorption peaks, with the edges red-shifted relative to the parent polymers. These polymers and complexes were applied to bulk heterojunction-type polymer solar cells and dye-sensitized solar cells.

    • Daiki Tanaka
    • Joji Ohshita
    • Yasushi Morihara
    Research
    Polymer Journal
    Volume: 45, P: 1153-1158

  • Silicon- and carbon-bridged polythiophenes, dithienosilole (DTS) and cyclopentadithiophene (DTC) homopolymers with 2-ethylhexyl or n-octyl substituents on the bridging atom, were synthesized and their optical and electrochemical properties were investigated. OFET devices containing the present polymer films as the active layers were fabricated to investigate their carrier transport properties. The device based on a DTS polymer with n-octyl substituents showed much higher carrier mobility than that of the DTC polymer with the same substituents.

    • Makoto Nakashima
    • Masayuki Miyazaki
    • Joji Ohshita
    Research
    Polymer Journal
    Volume: 48, P: 645-651