Polarizable amines and polymides for optical alignment of liquid crystals

A polarizable diamine of the general formula

• P—Lf—A—(NH2)q
• wherein A is a divalent or trivalent organic moiety, P is a polar group comprising a Pi electron system containing at least one heteroatom selected from the group N, O, and S;
• q is 2, and Lf consists essentially of:
• —X—(CH2)n—(CF2)p—(CH2)n—X—
• wherein —(CF2)p— is a straight chain or branched chain perfluoroalkyl radical, p is 4-20, X is selected from the group consisting of a covalent bond, —CH2O—, —CH2S—, —CH2NR—, —O—, —S— and —NR—, wherein R is a C1-C4 hydrocarbon, and n is up to 4.