Nematic phase comb-shaped polymers

The major advantage for the usage of LCPs as stationary phases for LC applications is that coating of the polymer on the silica gel is a simple process. However, also comb-shaped polymers prepared by octadecyl-acrylate and 3-mercaptopropyltrimethoxysilane as chain transfer agent can be immobilized on silica gel by bonding. It was shown that the telomer behaves as nematic material in the range of 42-47°C. The separation of geometrical isomers could be achieved. ... 

The values of the rotational viscosity coefflcients obtained for polymers X in the nematic phase (10-10 Pa sec) [37, 40], for polymer vn in the reentrant nematic phase (=5 10 Pa-sec) [42], and finally, the values of the Leslie viscosity coefficients (03, for polymer I (=10 Pa-sec) [43] also indicate the participation of the main chains of the macromolecules in orientational motion. It is evident that the polymeric viscosity of LC melts of comb-shaped polymers also determines all of the basic kinetic features of the orientational processes in external fields. 

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