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    Radical crossover reactions of a dynamic covalent polymer brush for reversible hydrophilicity control

    Year: 2014

    Journal: POLYMER, Vol. 55, p 4586-4592, 20150722

    Authors: Sato, Tomoya; Amamoto, Yoshifumi; Ohishi, Tomoyuki; Higaki, Yuji; Takahara, Atsushi; Otsuka, Hideyuki

    Organizations: Kyushu Univ, Grad Sch Engn, Nishi Ku, Fukuoka 8190395, Japan; Tokyo Inst Technol, Dept Organ & Polymer Mat, Meguro Ku, Tokyo 1528550, Japan; Kyushu Univ, Inst Mat Chem & Engn, Nishi Ku, Fukuoka 8190395, Japan

    Reversible hydrophilicity control of a radically exchangeable polymer brush with dynamic covalent linkages was successfully demonstrated. A polymer brush with alkoxyamine units was prepared via surface-initiated atom transfer radical polymerization, and reversible surface hydrophilicity control was achieved via dynamic covalent exchange reactions of alkoxyamines. Exchange reactions between alkoxyamine units in the side chains of the polymer brush and the terminal of poly(4-vinylpyridine) (P4VP) were carried out in order to prepare a side-chain functionalized polymer brush. Subsequent quaternization of P4VP chains with iodomethane was carried out to prepare a more hydrophilic surface. In addition, a de-grafting reaction of the quaternized P4VP side chains was performed to confirm reversibility of the alkoxyamine via radical exchange reactions on the surface. All the composition and wettability changes were investigated via X-ray photoelectron spectroscopy and contact angle measurements. (C) 2014 Elsevier Ltd. All rights reserved.