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