Effect of macrocycles on the temperature-responsiveness of poly[(methoxy diethylene glycol methacrylate)-graft-PEG]

Hiromi Kitano*, Tadashi Hirabayashi, Makoto Gemmei-Ide, Mayumi Kyogoku

*この論文の責任著者

研究成果: ジャーナルへの寄稿学術論文査読

64 被引用数 (Scopus)

抄録

A homopolymer of 2-(2′-methoxyethoxy)ethyl methacrylate (DM) dissolved in pure water demonstrated an abrupt increase in its turbidity at a critical temperature (LCST). Meanwhile, the LCST for a copolymer of DM and ω-methoxy(oligoethyleneoxy)ethyl methacrylate (PaM) (PDMP aM) significantly increased with increasing content of PaM residue. Furthermore, the addition of macrocycles such as hexasodium calix[6]arenehexasulfonic acid (SCX6), α-cyclodextrin (α-CD) and 2,6-di-O-methyl-β-cyclodextrin (DM-β-CD) changed the LCST. SCX6 raised the LCST significantly, DM-β-CD slightly raised the LCST and α-CD slightly lowered it. These phenomena could be attributed to the formation of an inclusion complex (polypseudorotaxane) at the grafted PEG chain of the copolymer. ROESY, fluorescence measurements and the viscosity behavior of the SCX6-PEG dimethylether (PEG-DME) mixture supported the theory of the complexation of SCX6 with the PEG chain. The apparent association constants (Kapp) of PEG-DME or grafted PEG with SCX6 and α-CD were determined using fluorescence and UV-vis absorption measurements, respectively. The complexation of the SCX 6-polymer conjugate with PDMPaM was also examined by time-evolution measurements of the turbidity. The effect of the structure of guest and host molecules on the LCST for the copolymer was discussed in detail.

本文言語英語
ページ(範囲)1651-1659
ページ数9
ジャーナルMacromolecular Chemistry and Physics
205
12
DOI
出版ステータス出版済み - 2004/08/12

ASJC Scopus 主題領域

  • 凝縮系物理学
  • 物理化学および理論化学
  • ポリマーおよびプラスチック
  • 有機化学
  • 材料化学

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