Liquid side group

Liquid crystal polymers are also used in electrooptic displays. Side-chain polymers are quite suitable for this purpose, but usually involve much larger elastic and viscous constants, which slow the response of the device (33). The chiral smectic C phase is perhaps best suited for a polymer field effect device. The abiHty to attach dichroic or fluorescent dyes as a proportion of the side groups opens the door to appHcations not easily achieved with low molecular weight Hquid crystals. Polymers with smectic phases have also been used to create laser writable devices (30). The laser can address areas a few micrometers wide, changing a clear state to a strong scattering state or vice versa. Future uses of Hquid crystal polymers may include data storage devices. Polymers with nonlinear optical properties may also become important for device appHcations. 

Shibaev, V. P. and Plate, N. A. Thermotropic Liquid-Crystalline Polymers with Mesogenic Side Groups, Vol. 60/61, pp. 173—252. 

Note that the groups and jr represent the mass transfer resistances on the gas and liquid sides, respectively. 

SW Chang, AK Li, CW Liao, and CS Hsu, Polarized blue emission based on a side chain liquid crystalline polyacrylate containing hw-tolane side groups, Jpn. J. Appl. Phys., 41 1374-1378, 2002. 

Fig. 34. Examples of side-group polymer liquid crystals I - mesogenic group, II - spacer, III - backbone. The terminology side-group is used for (a), side-on fixed is used for (b), end-on fixed for (c) and side-chain for (d).

Liquid-crystalline polymer consisting of macromolecules in which mesogenic groups are incorporated both in the main-chain and in the side-groups. 

Liquid crystal polymers having 1,3-dithiane or 1,3-oxathiane rings as mesogenic side groups exhibit the extremely important liquid crystal phase at around room temperature <1999MI335>. 1,3-Oxathianes have also been applied as perfumery and flavoring ingredients other derivatives exhibit excellent herbicidal activity and 1,3-oxathiane derivatives have been employed as corrosion inhibitors for steel. 

VI), were prepared in a mixture containing a crosslinkable monomer having liquid crystalline group side chains. 

The liquid polymer is converted to the rubbery state by reagents that react with mercaptan (-SH) and side groups of the polymer segments by oxidation, addition or condensation to effect sulfide (-S-S-) bond formation. The oxidation reactions are exothermic and accelerated by an alkaline environment. The most commonly employed oxidizing agents which are suitable for curing liquid polymers are cobalt or manganese or lead octoate, p-quinonedioxime and di- or tri-nitrobenzene. Epoxy resin also reacts with liquid polysulfide polymers by addition in the presence of an aliphatic or aromatic amine and polyamide activator as shown in Equation 5.8 ... 

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