Comb polymer liquid crystals

ELASTIC MODULI AND ACOUSTIC ABSORPTION OF COMB POLYMER LIQUID CRYSTALS... 

The study cess of LC comb the main peculi of LC polymers liquid crystals like polymeric in the presence bility and the in making LC po teristics. 

Figure 3.1 Schematic designs of (a) longitudinal and (b) comb-like polymer liquid crystals with non-covalent bonds.

TABLE 8.1. Dielectric Transitions in Comb-Shaped Liquid-Crystal Polymers... 

The data on the conformational composition (trans/gauche) of the aliphatic spacer in comb-shaped liquid-crystal polymer I with a different degree of polymerization (DP) in the starting and oriented states for T 20 C are... 

On the whole, it is possible to state that the tendency toward orientation of the side branches of the macromolecules forming the LC phase with the corresponding dielectric and diamagnetic anisotropy is the driving force of orientation processes in comb-shaped polymers. The interaction of the side groups with the external field sets the main chains in motion, which also determines certain specific features of polymer liquid crystals wtih respect to the effect of external fields. 

Comb-Shaped Liquid-Crystal Polymers V. P. Shibaev... 

N. A. Plate and V. P. Shibaev. Comb-Shaped Polymers and Liquid Crystals, Plenum, New York (1988). 

Plate, N. A., Shibaev, V. P. Comb-Like Polymers and Liquid Crystalls (in Russian), Moscow Khimiya 1980... 

Thus, polymers with mesogenic groups in side chains form structural mesophases of the same types as low-molecular liquid crystals. This makes it possible to apply traditional mesophase classification for the description of the structure of LC polymers. At the same time, the structure of some of comb-like polymers (see Table 5) considered as crystalline, may probably be treated as one of highly-ordered smectic mesophases (SH or Sj), whose study is only started74). 

---