Hydration changes of poly(2-(2-methoxyethoxy)ethyl methacrylate) during thermosensitive phase separation in water.

Hydration changes of poly(2-(2-methoxyethoxy)ethyl methacrylate) during thermosensitive phase separation in water. Research Abstract Details 

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Hydration changes of poly(2-(2-methoxyethoxy)ethyl methacrylate) during thermosensitive phase separation in water. Abstract Text:

Yasushi Maeda,Tomoyuki Kubota,Hideo Yamauchi,Tadashi Nakaji,Hiromi Kitano,Yasushi Maeda,Tomoyuki Kubota,Hideo Yamauchi,Tadashi Nakaji,Hiromi Kitano,

Hydration changes of poly(2-(2-methoxyethoxy)ethyl methacrylate) (PMoEoEMa) during thermosensitive phase separation in water have been investigated by infrared spectroscopy. The C=O stretching band can be separated into three components assigned to non-hydrated carbonyl groups and singly and doubly hydrogen-bonded carbonyl groups (1728, 1709, and 1685 cm-1, respectively). Relatively large parts of the carbonyl groups (50% in 30 wt % solution) do not form hydrogen bonds even below the transition temperature (Tp) probably because they possess crowded positions near the backbone. The fraction of hydrogen-bonding carbonyl groups decreased during phase separation by approximately 0.2. Among five nu(C-H) bands, the highest- and the lowest-frequency bands (nu(C-H)A and nu(C-H)E) exhibited relatively large red shifts of 8 and 11 cm(-1), respectively. DFT calculations indicate that the formation of a H-bond between the ether oxygen and water leads to blue shifts of nu(C-H) of adjacent alkyl groups and has a larger effect than a direct H-bond to the alkyl groups, namely, C-H...O H-bonds. The fraction of hydrogen-bonding methoxy oxygens estimated from the position of the nu(C-H)A is 1 at Tp. This result indicates that the methoxy oxygens and the carbonyl are more favorably hydrated than the other at Tp, respectively.

Hydration changes of poly(2-(2-methoxyethoxy)ethyl methacrylate) during thermosensitive phase separation in water. Publishing Authors By Initials

Y Maeda,T Kubota,H Yamauchi,T Nakaji,H Kitano,Y Maeda,T Kubota,H Yamauchi,T Nakaji,H Kitano,

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Hydration changes of poly(2-(2-methoxyethoxy)ethyl methacrylate) during thermosensitive phase separation in water. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Langmuir : the ACS journal of surfaces and colloid

VOLUME: 23

Page Numbers: 11259-65

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ISSN: 0743-7463

DAY: 22

MONTH: 09

YEAR: 2007

Hydration changes of poly(2-(2-methoxyethoxy)ethyl methacrylate) during thermosensitive phase separation in water. Information

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LANGUAGE: eng

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AFFILIATION: Department of Applied Chemistry and Biotechnology, University of Fukui, Fukui 910-8507, Japan. y_maeda@acbio2.acbio.fukui-u.ac.jp

Country: United States

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MEDLINETA: Langmuir

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