Design of temperature-responsive polymers with enhanced hysteresis: α,α-disubstituted vinyl polymers

Takeshi Mori, Suguru Beppu, Mohamed R. Berber, Hironori Mori, Takumi Makimura, Ayako Tsukamoto, Keiji Minagawa, Tomohiro Hirano, Masami Tanaka, Takuro Niidome, Yoshiki Katayama, Tatsuya Hirano, Yasushi Maeda

    Research output: Contribution to journalArticlepeer-review

    20 Citations (Scopus)


    Three temperature-responsive polymers which are R,R-disubstituted vinyl polymers having two amphiphilic groups (ethylamide or ethylester) per monomeric unit were designed. Two of these polymers showed unusually large hysteresis in their phase transition temperatures between a heating and a cooling process. This hysteresis resulted from the extremely slow kinetics of the dissolution process of the aggregated polymer chains in the cooling process due to intraand interchain interactions including hydrogen bonding and hydrophobic interaction. The high density of the amphiphilic substituents on the polymer chain due to the α,α-disubstituted structure enhanced these intra- and interchain interactions. The large hysteresis was also observed in the volume change of a corresponding hydrogel. These new classes of temperature-responsive polymers are interesting materials because their large hystereses can be regarded as erasable memory function.

    Original languageEnglish
    Pages (from-to)9224-9232
    Number of pages9
    Issue number12
    Publication statusPublished - Jun 15 2010

    All Science Journal Classification (ASJC) codes

    • General Materials Science
    • Condensed Matter Physics
    • Surfaces and Interfaces
    • Spectroscopy
    • Electrochemistry


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