Structural formulas, mesogens

The situation looks more complicated for polymers with mesogenic groups in the side chain, but in fact it is rather simple too. All these polymers can be represented by a general structural formula structure I in Fig. 6.17. This structure can immediately be derived from the general structure of comb-polymers (structure II in Fig. 6.17) the SCLCP is a comb-polymer with an... 

Chemical Formula Chemical Structure Mesogenic Index Group Contribution... 

Materials. The LCPs 1-4 and low molecular weight analogues 5-8 which we consider in detail have the molecular structures shown in Fig. 13. The Greek letters, , p, 8, and different derivatives of the same LC, deuteriated at different sites of the mesogen or alkyl chain, as indicated in the formula of LCP 4. Synthetic... 

Also important for the chemical structure of FLCPs are the link groups connecting together the main chain, spacer, mesogenic core, and terminal (mostly chiral) fragment. As seen from the preceding formulas, ester and ether connections are most typical. A ketone connection has been used [28]. As compared with ester... 

Another research group published numerous studies of syntheses and physical properties of LC-polyethers having linear chains, hyperbranched and cyclic structures or containing discotic mesogens [327-341]. All these different LC-polyethers were prepared via the normal Williamson ether synthesis involving the nucleophilic attack of a phenoxide ion onto a bromoalkane. For instance, numerous linear LC-polyesters were prepared from the mesogenic diphenols outlined in (214) and formulas (215a,b) [327,337]. 

With respect to the role of the configuration of the main chain in the formation of the LC phase, the situation here is close to what takes place in comb-shaped polymers without mesogenic groups a difference in the configurational structure of the macromolecules has little effect on the properties of the mesophase. A comparison of the properties of two samples of LC polymers with the general formula... 

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