The present invention relates to novel polyimides derived from 6FDA and from 3,3-dihydroxy-4,4-diaminobiphenyl and novel polyimides derived from PMDA and from Bis-AP-AF, having alkyl, arylalkyl, heteroarylalkyl, (cycloalkyl)alkyl, fluoroalkyl or siloxane side groups. The present invention also relates to a method of producing nematic liquid-crystal devices, which comprises the steps consisting in:

• depositing one of the polyimides according to the invention on a substrate;
• annealing the polyimide in one or more steps; and
• defining an azimuthal orientation of the polyimide coating.