Three SCLCP

If the mesogen and the length of the spacer are the primary factors determining the specific mesophase(s) exhibited by a given SCLCP, then its thermotropic behavior should be predictable by comparison to an appropriate model compound. Three possibilities for an appropriate model compound are shown in Table 6 and Fig. 12 using poly n-[(4 -(4"-cyanophenyl)phenoxy)-... 

In addition to this SCLCP host, MCLCPs have also been used. Li et al. [ 168] dissolved molecules of an oligomeric fragment of po-ly(p-phenylenebenzobisthiazole) 10, which was terminated by opposing nitro and di-methylamino groups, in the polymer itself. The resultant material has a value of 6x10 esu. Stupp et al. [169, 170] carried out a careful analysis of the system of Disperse Red 1 (11) dissolved in a chemically aperiodic nematic polymer containing the following three structural units (12). 

Polymeric liquid crystals can be classified into either of two types, thermotropic and lyotropic, according to their formation conditions, or three types, main-chain, side-chain and complex liquid crystalline polymer (MCLCP, SCLCP and CLCP,... 

First to observe and classify different dielectric relaxtion processes present in scLCPs were Zentel and coworkers/ who studied unoriented samples of several different polyacrylate-based scLCPs over a wide range of temperature, covering the isotropic, mesomorphic, and solid states (Fig. 4.23). They observed up to three high-frequency relaxations (namely, the and y-processes) in the glassy state, and... 

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