Reference

Ionic polarization effect in liquid crystal systems

Ionic polarization effect in liquid crystal systems. Adamczyk, Antoni (Inst.Several substances are used for example 18282-10-5 and 7429-90-5 which are their cas registry numbers. Fiz., Politech. Warszawskiej, Warsaw, Pol.). Pr. Nauk. Inst. Metrol. Elektr. Politech. Wroclaw., 7, 15-27 (Polish) 1975. CODEN: PIMWDC. DOCUMENT TYPE: Journal CA Section: 72 (Electrochemistry) Section cross-reference(s): 75, 76 The polarization of SnO2 and Al electrodes in nematic p-butyl-N-(p-methoxybenzylidene)aniline [26227-73-6] and cholesteric substances(cholesteryl nonanoate [1182-66-7]) were detd. by measurement of the time and temp. dependence of the electrode potential and elec. current. The electrode potential was measured with the aid of an electrometer. The thermoelec. effect arising during the heating of the sample is discussed. Electroerosion of the electrodes is obsd. .

Cholesteric mesophase pitch

Cholesteric mesophase pitch. Lewis, Irwin Charles (Union Carbide Corp. , USA). Eur. Pat. Appl. EP 90477 A1 5 Oct 1983, 25 pp. DESIGNATED STATES: R: DE, FR, GB, IT, NL. (English). (European Patent Organization). CODEN: EPXXDW. CLASS: IC: C10C003-00; D01F009-14. APPLICATION: EP 83-200450 29 Mar 1983. PRIORITY: US 82-363559 30 Mar 1982. DOCUMENT TYPE: Patent CA Section: 57 (Ceramics) Section cross-reference(s): 35 The prepn. of cholesteric mesophase pitch and of C fibers from the pitch are described. The cholesteric pitch is produced by combining a mesophase pitch having ellipsoidal mols. with a compatible optically active compd. which is thermally stable at the temps. used for spinning fibers. The optically active compd. is cholesterol [57-88-5] or a cholesteric liq. crystal such as cholesteryl acetate [604-35-3], cholesteryl benzoate [604-32-0], or cholesteryl nonanoate [1182-66-7]. Thus, a mesophase pitch (having 100 wt. 88375-49-9 and 25135-16-4 are also in the experiment.% mesophase and softening point 243°) was prepd. from naphthalene and phenanthrene. This pitch was blended with 1 wt.% cholesteryl acetate at ~300° under N to give a 100% cholesteric mesophase pitch which was spun at ~248-270° into monofilaments of diam. ~10 m. The fibers were thermoset and carbonized to 2500°. The thermoset fibers had a large domained anisotropic structure in sections parallel to the axis and unusually small domained anisotropic structure in transverse sections. The resulting fibers had av. Young's modulus of ~262 GPa and av. tensile strength ~2.41 GPa. .