Polymerization and Membrane Characteristics of Aqueous Bilayers of Glutamate-Based Double-Chain Ammonium Amphiphiles

Toyoki Kunitake, Naotoshi Nakashima, Masashi Kunitake

研究成果: ジャーナルへの寄稿記事

21 引用 (Scopus)

抄録

A series of monoacryl and diacryl double-chain ammonium amphiphiles were synthesized and their bilayer characteristics before and after photopolymerization were examined. UV irradiation of unpolymerized bilayer dispersions in water gave polymerized bilayers without much change in the aggregation number, although the morphologies of the latter as observed by negative-staining electron microscopy were less ordered than those of the former. The molecular weight of the polymers in organic solvents amounted to several millions. Diacrylated bilayers gave large fractions of the insoluble product upon polymerization. The molecular organization in the polymerized bilayer was scrutinized by a combination of thermal and spectral measurements. Differential scanning calorimetry showed that sharp phase transitions observed in the unpolymerized bilayers became broader and were accompanied by hysteresis upon polymerization. The benzene unit in the spacer portion of a polymerizable amphiphile was a versatile internal probe for assessing the bilayer alignment. The much enhanced circular dichroism of the unpolymerized, crystalline bilayer was reduced and displayed large hysteresis upon polymerization. Strong fluorescence emission from the benzene unit was observed in the crystalline bilayers. Fluorescence recovery after rapid cooling and absorption spectral equilibration of a membrane-bound cyanine dye were also slow in the polymer. A certain degree of disordering in the molecular alignment remained for bilayers polymerized in the liquid-crystalline state.

元の言語英語
ページ(範囲)3544-3550
ページ数7
ジャーナルMacromolecules
22
発行部数9
DOI
出版物ステータス出版済み - 9 1 1989

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Amphiphiles
Ammonium Compounds
Glutamic Acid
Polymerization
Crystalline materials
Benzene
Membranes
Hysteresis
Polymers
Fluorescence
Molecular orientation
Photopolymerization
Dichroism
Dispersions
Organic solvents
Electron microscopy
Differential scanning calorimetry
Coloring Agents
Agglomeration
Dyes

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

これを引用

Polymerization and Membrane Characteristics of Aqueous Bilayers of Glutamate-Based Double-Chain Ammonium Amphiphiles. / Kunitake, Toyoki; Nakashima, Naotoshi; Kunitake, Masashi.

:: Macromolecules, 巻 22, 番号 9, 01.09.1989, p. 3544-3550.

研究成果: ジャーナルへの寄稿記事

Kunitake, Toyoki ; Nakashima, Naotoshi ; Kunitake, Masashi. / Polymerization and Membrane Characteristics of Aqueous Bilayers of Glutamate-Based Double-Chain Ammonium Amphiphiles. :: Macromolecules. 1989 ; 巻 22, 番号 9. pp. 3544-3550.
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