A distinct smectic C₂ liquid crystal observed in main-chain liquid crystalline polymer

Thermotropic Liquid Crystals of Main-Chain Polyesters with a Mesogenic 4,4′-Biphenyldicarboxylate Unit XII. Unusual Molecular Orientation in Fibers Drawn from Smectic Melt

“…10 In Figure I (b) for BB-5 fiber, the sharp inner reflection is found on meridian while the broad reflections are split above and below the equator, leading to the ScA structure. 2 In Figure I ( c) for BB-4( IMe), inner reflections are split into two positions around meridian and broad reflections are centered on equator. These characteristic diffraction patterns are attributable to the Sc structure.…”

Several Interesting Fields Exploited through Understanding of Polymeric Effects on Liquid Crystals of Main-Chain Polyesters

“…The broad outer reflections are split into two portions lying above and below the equator while the layer reflections appear on a meridional line as in BB-6. 2,6 In this case, the layered packing structure can be illustrated such that the polymer chains lie perpendicular to the layer as in BB-6 but the mesogenic groups are tilted to the layer normal (see Figure 3d). Tilt angle is independent of temperature and elucidated about 25 from the splitting angle of the broad reflections.…”

Bent-shaped liquid crystal dimers. Influence of the direction of the oxybiphenylenecarboxyl groups on their mesomorphic behavior

“…13,14 In anticlinic SmC A phases, the manifestation of such singularities is the result of an opposite tilt direction of the mesogenic groups between adjacent layers. 15,16 On further cooling, the soft crystal E phase shows another of its characteristic textures, i.e., the schlieren texture of the SmC A phase changed to a 'scale'-like mosaic texture ( Figure 3d). On the other hand, the monomeric 6M5 shows only an untilted SmA phase.…”