Third-order nonlinear optical main chain polymer material and method for preparing the same

摘要

A third-order nonlinear optical main chain polymer material contains a high chi (3) component having no less than 3 but no more than 7 pi -conjugated bonding groups and having an electron donor in the main chain of the polymer through covalent bonds. The donor is preferably an alkylamino structure, more preferably a dialkylamino structure. Particularly preferred is a diethylamino structure. The high chi (3) component is preferably a phenylene ring system of which phenylene rings are bonded through azo bonding groups with the phenylene rings and the azo bonding groups being positioned alternately. The polymer main chain is polyurethane or polyester. The third-order nonlinear optical main chain polymer material is prepared by polyaddition of a high chi (3) compound, i.e., a precursor of the high chi (3) component, having a hydroxyl group at each end with a diisocyanate compound or by polycondensation of the high chi (3) compound with a dicarboxylic acid.