Isocyanate Cross-Linked Polymers for Nonlinear Optics. 2. Polymers Derived from 4-{[2-Methyl-4-nitro-5-(hydroxymethyl)phenyl]azo}- N,N-bis(2-hydroxypropyl)-3-methylaniline

Abstract

A poled and cross-linked nonlinear optically active polymer was prepared from 4-{[2‘-methyl-4‘-nitro-5‘-(hydroxymethyl)phenyl)azo}-N,N-bis(2-hydroxypropyl)-3-methylaniline and multifunctional isocyanates. After an initial 5% loss in nonlinearity of this polyurethane immediately after poling, the polar alignment was unchanged even after 1000 h at 100 °C. The polymer displayed a stable electrooptic coefficient (r33) of 9.4 pm/V.