Thermotropic liquid‐crystalline polymers, 28. Structural transformation “nematic‐smectic A — reentrant nematic” in a comb‐like polymer and its mixture with a low‐molar‐mass liquid‐crystal compound

Comb‐like liquid‐crystalline polyacrylate, 1, containing 4′‐cyano‐4‐biphenylyl mesogenic groups and forming a reentrant nematic (Nr) phase, as well as its mixture with 4‐cyano‐4′‐hexyloxybiphenyl were studied by X‐ray diffraction. X‐ray diffraction patterns of magnetically‐oriented samples and the micro‐densitometer curves obtained from them allowed to observe the distortion of the layers with orthogonal packing of the mesogenic groups in the Nr phase. These results are compared with electrooptical data obtained earlier. As a result a domain formation with tilted arrangement of the mesogenic groups in the pseudolayer is proposed.