Cellulose Chlorophenyl derivatives

Carbamates. Many examples of cellulose derivatives as chiral stationary phases (CSPs) in liquid chromatography and capillary electrophoresis have been reported in the literature [43,44]. Chankvetadze et al. [43] used cellulose chlorophenyl carbamates as liquid chromatography stationary phases to resolve enantiomers of several chiral drugs including sedatives... [Pg.59]

Woo the temperature dependence of pitch for chiral nematic polymers does not seem to follow any particular pattern. It is believed that as temperature is increased, specific interactions, e.g., hydrogen bonding, whether inter- or intramolecular or polymer-solvent interactions are destroyed. The polymer chains become more flexible and the side groups more easily relaxed, thereby changing the physical properties of the chiral nematic structure. Similarly, an increase in concentration leads to a decrease in pitch for most lyotropic cellulosic liquid crystals with the exception of cellulose tricarbanilate (CTC) in ethyl methyl ketone, 2-penta-none, or tiiethylene glycol monoether and the chlorophenyl urethane derivative in diethylene glycol monoether. ... [Pg.2666]