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Mesomorphic Transition Temperatures and Viscosities for Some Cyano-biphenyls and - p -terphenyls with Branched Terminal Alkyl Groups

1984; Volume: 104; Issue: 3-4 Linguagem: Inglês

10.1080/00268948408070435

0026-8941

G. W. Gray, Stephen M. Kelly,

Material Dynamics and Properties

Abstract A number of 4-alkyl- and 4-alkoxy-4′-cyanobiphenyls and 4-alkyl-4"-cyano-p-terphenyls with branched chains have been prepared. Marked depressions in the Liquid crystal transition temperatures have been observed relative to those for the corresponding n-alkyl derivatives, although the melting points are affected to a smaller extent. The viscosities of 10 wt% solutions of the individual branched-chain materials in the commercial mixture E7 have been determined at 0°C and 25°C and substantial increases in the measured bulk viscosities have been recorded.