Title

Deuterium NMR and Low-angle X-ray Studies of a Polymerizable Liquid Crystalline System

Abstract

A double-chain alkyl amphiphilic methacrylic monomer was synthesized and its behavior in the surfactant/ water system determined using deuterium NMR, low-angle X-ray diffraction, and polarizing microscopy. This surfactant was [bis((2-((n-dodecylcarbonyl)oxy)ethyl)carbamoyl)methyl]dimethyl[2- (methacryloyloxy)ethyl]ammonium bromide (DLMDAB). Deuterium NMR quadrupole splitting was used to determine the partial phase behavior of the surfactant-D2O system. Two kinds of lamellar liquid crystal phases of DLMDAB with water have been observed over a large concentration (45-95 wt % of surfactant) and temperature (15-55°C) range which were characterized by different quadrupole splittings, presumably corresponding to different amounts of D2O between the surfactant bilayer. The geometric parameters (surface area per head group of amphiphile) were obtained from low-angle X-ray diffraction. X-ray measurements were not particularly sensitive to the presence of biphasic material while the deuterium NMR quadrupole splittings from D2O were. © 1992 American Chemical Society.

Department(s)

Chemistry

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1992 American Chemical Society (ACS), All rights reserved.


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