Design of Temperature-Responsive Polymers with Enhanced Hysteresis: alpha,alpha-Disubstituted Vinyl Polymers

作者：Mori Takeshi^*; Beppu Suguru; Berber Mohamed R; Mori Hironori; Makimura Takumi; Tsukamoto Ayako; Minagawa Keiji; Hirano Tomohiro; Tanaka Masami; Niidome Takuro; Katayama Yoshiki; Hirano Tatsuya; Maeda Yasushi

来源：Langmuir, 2010, 26(12): 9224-9232.

DOI：10.1021/la100020t

Three temperature-responsive polymers which are alpha,alpha-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 intra- and interchain interactions including hydrogen bonding and hydrophobic interaction. The high density of the amphiphilic substituents on the polymer chain due to the alpha,alpha-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.

• 出版日期2010-6-15