Physicochemical Properties of Hydrophobically Modified Polymeric Betaines and of Their Langmuir-Blodgett Films

Evgeniya V. Seliverstova, Niyaz Kh Ibrayev, Alexey V. Shakhvorostov, Nurxat Nuraje, Sarkyt E. Kudaibergenov

Результат исследований: Материалы для журналаСтатьярецензирование

1 Цитирования (Scopus)

Аннотация

Polymeric betaines containing long alkyl chains (C12H25, C13H27, C14H29, C16H33 and C18H37) were synthesized by Michael addition reaction of alkylaminocrotonates and methacrylic acid. They were characterized by FTIR, 13C NMR, DLS, TEM, viscometry and zeta-potential measurements. In aqueous KOH and DMSO solutions the hydrophobically modified polymeric betaines behave polyelectrolyte character. The average hydrodynamic size and zeta potential of diluted aqueous solutions of hydrophobic polybetaines containing tetradecyl- and octadecyl groups were studied as a function of pH. Anomalous low values of the isoelectric point (IEP) of amphoteric macromolecules were found to be in the range of pH 2.7-3.4. The TEM results revealed that in both aqueous KOH and DMSO media the nano- and microsized micelles and vesicles are existed. The structural organization of micelles and vesicles in water and water - DMSO mixture is discussed. Langmuir-Blodgett (LB) monolayers on the water-air interface were obtained by spreading of hydrophobic polybetaines containing tetradecyl- and octadecyl groups dissolved in THF on the subphase surface. The LB films on the subphase surface are characterized by the specific areas of 0.6 ± 0.05 nm2 · monomeric unit-1 at collapsed state. In the spectra of Langmuir-Blodgett film the absorption band with the maximum at 255 and 270 nm was observed.

Язык оригиналаАнглийский
Страницы (с-по)36-48
Число страниц13
ЖурналMacromolecular Symposia
Том363
Номер выпуска1
DOI
СостояниеОпубликовано - 1 мая 2016
Опубликовано для внешнего пользованияДа

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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