Vinylidene cyanide alternating copolymers exhibiting nonlinear optical and piezoelectric properties

摘要

In one embodiment this invention provides vinylidene cyanide copolymers with alternating monomeric units as illustrated by the following structure: <IMAGE> +TR <IMAGE> An invention vinylidene cyanide copolymer in the form of an electret film exhibits a high level of longitudinal piezoelectric effect, and has excellent processability properties. An electret film which has an external electric field-induced noncentrosymmetric dipolar molecular orientation exhibits second order nonlinear optical susceptibility under light propagation conditions.