Liquid crystals from poly(4,4'-methoxybiphenylyl methacrylate)

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Abstract
Side-chain liquid crystalline poly(4,4'-biphenylyl methacrylate) was studied by X-ray diffraction. Three smectic phases were described using a ribbon-like structural model for the polymer chain. In the smectic SP phase, ribbons lie flat on their sides to form layers with a spacing equal to the thickness of the ribbons. In the smectic SA phase, the ribbons stand upright giving layers with a thickness corresponding to the length of one extended monomeric unit. In the ordered smectic So phase, the layer thickness also corresponds to one extended repeat unit, and the pendant groups are arranged according to a two-dimensional oblique lattice. The Schlieren texture observed in the SP phase was analysed in terms of symmetry

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