Unusually Large Hysteresis of Temperature-Responsive Poly(N-ethyl-2- propionamidoacrylamide) Studied by Microcalorimetry and FT-IR

Mohamed R. Berber, Hironori Mori, Inas H. Hafez, Keiji Minagawa, Masami Tanaka, Takuro Niidome, Yoshiki Katayama, Atsushi Maruyama, Tomohiro Hirano, Yasushi Maeda, Takeshi Mori

    研究成果: ジャーナルへの寄稿学術誌査読

    18 被引用数 (Scopus)

    抄録

    We reported here the full characterization of the hysteresis of the phase transition behavior of an aqueous solution of poly(N-ethyl-2- propionamidoacrylamide) (PNEPA), which has a unique α,α- disubstituted structure, by using microcalorimetry and FT-IR. Phase transition temperatures near the thermodynamic equilibrium were determined by extrapolating the scanning rate of the microcalorimetry to zero. The calculated hysteresis from the phase transition temperature was unusually very large (∼8 °C). FT-IR analysis indicated that the large hysteresis of PNEPA resulted from a coupling of intra-/intermonomeric unit hydrogen bonds, which is known to occur in a Β-sheet of proteins but has never been reported in temperature-responsive polymers. The effects of the molecular weight and polymer concentration on the hysteresis were studied by using fractionated PNEPAs and it was found that a low molecular weight and a low concentration enhanced the hysteresis.

    本文言語英語
    ページ(範囲)7784-7790
    ページ数7
    ジャーナルJournal of Physical Chemistry B
    114
    23
    DOI
    出版ステータス出版済み - 6月 17 2010

    !!!All Science Journal Classification (ASJC) codes

    • 物理化学および理論化学
    • 表面、皮膜および薄膜
    • 材料化学

    フィンガープリント

    「Unusually Large Hysteresis of Temperature-Responsive Poly(N-ethyl-2- propionamidoacrylamide) Studied by Microcalorimetry and FT-IR」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

    引用スタイル