title: Design of temperature-responsive polymers with enhanced hysteresis: alpha,alpha-disubstituted vinyl polymers.
abstract: 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.
authors.affiliation: Department of Applied Chemistry, Kyushu University, 744 Moto-oka Nishi-ku, Fukuoka 819-0395, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Mori
authors.forename: Suguru
authors.initials: S
authors.lastname: Beppu
authors.forename: Mohamed R
authors.initials: MR
authors.lastname: Berber
authors.forename: Hironori
authors.initials: H
authors.lastname: Mori
authors.forename: Takumi
authors.initials: T
authors.lastname: Makimura
authors.forename: Ayako
authors.initials: A
authors.lastname: Tsukamoto
authors.forename: Keiji
authors.initials: K
authors.lastname: Minagawa
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Hirano
authors.forename: Masami
authors.initials: M
authors.lastname: Tanaka
authors.forename: Takuro
authors.initials: T
authors.lastname: Niidome
authors.forename: Yoshiki
authors.initials: Y
authors.lastname: Katayama
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Hirano
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Maeda
mesh_terms: D000577:Amides; D004952:Esters; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D011108:Polymers / Q000737:chemistry*; D013696:Temperature; D044366:Transition Temperature; D014753:Vinyl Compounds / Q000737:chemistry*
chemical_list: D000577:Amides; D004952:Esters; D011108:Polymers; D014753:Vinyl Compounds; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate