Ionically bonded PLC complexes

The formation of the latter complexes can be followed by infrared spectroscopy, as it involves a proton transfer from the acid of poly (acrylic acid) to the tertiary amine of the mesogens. Complexation results in a significant reduction, or almost complete elimination, for the equimolar complexes, of the acid carbonyl band near 1700 cm and the appearance of a new band near 1550cm attributed to the asymmetric carboxylate stretch. The residual carbonyl absorption that remains in the equimolar mixtures indicates the presence of a small 

Complexes of polyelectrolytes with oppositely charged surfactants in (aqueous) solution have received considerable attention (most often at low concentrations of surfactant, to avoid precipitation), which we will not discuss, e.g. [34]. They have also been used to form mono-and multilayer structures [35,36]. Properties of such complexes in the solid state have only recently been investigated [35-40]. They are generally prepared from aqueous solutions where cooperative electrostatic binding and precipitation occurs. Once formed, the complexes can be water insoluble, yet dissolve in other solvents. For example, complexes of poly(N-ethy 1-4-vinylpyridinium bromide) with sodium bis(2-ethylhexyl) sulfosuccinate) [41] or with sodium dodecyl sulfate [42] are soluble in aliphatic hydrocarbon or other low-polarity solvents. 

Some studies of longitudinal ion-containing PLCs involve complexed poly(ethylene oxide) backbone segments [55,56] and ionic groups in the main chain [57-59]. The PLCs in references 57-59, in particular, will 

This section has shown that the presence of ionic groups, whether in complexed systems or otherwise, tends to lead to a layered molecular organization, where an ionic sublayer alternates with a nonionic sublayer. Most frequently, a smectic A-like structure is involved. It remains to be seen to what extent other disordered mesophases can be generated in ionically complexed systems, and how various parameters affect these phases. 

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See also in sourсe #XX -- [ , ]

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