NMR-INVESTIGATIONS OF FIELD-INDUCED ORIENTATION IN LIQUID-CRYSTALLINE POLYMER LAYERS

Solid state NMR is used to study the orientational order in thin layers of a liquid-crystalline polymer after a preceding influence of an orienting field. Samples were produced of polysiloxane with the mesogenic group in the side chain by melting the polymer between plated glass. In order to achieve a good orientation cooling has been stopped at the clearing temperature for 2 h and then carried on to room temperature with the electric and the magnetic field, respectively, still applied. Alignment of domains could be realized only in part by the electric dc field.