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

详细信息    查看全文

• 作者：Takeshi Mori ; Suguru Beppu ; Mohamed R. Berber ; Hironori Mori ; Takumi Makimura ; Ayako Tsukamoto ; Keiji Minagawa ; Tomohiro Hirano ; Masami Tanaka ; Takuro Niidome ; Yoshiki Katayama ; Tatsuya Hirano ; Yasushi
• 刊名：Langmuir
• 出版年：2010
• 出版时间：June 15, 2010
• 年：2010
• 卷：26
• 期：12
• 页码：9224-9232
• 全文大小：1046K
• 年卷期：v.26,no.12(June 15, 2010)
• ISSN：1520-5827

文摘

Three temperature-responsive polymers which are α,α-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 α,α-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.