Characterization of a Side Chain Polymer for Second-Order Nonlinear Opticla Properties

摘要

We report the characterization of copolymers of methyl methacrylate (MMA) and 2-propenoic acid, 2-methyl-, 2-[[[[4-methyl-3-[[(2-methyl-4-nitrophenyl) amino]carbonyl]aminophenyl]carbonyl]oxy] ethyl ester (PAMEE) exhibiting nonlinear optical (NLO) properties. The linear copolymer, poly(MMA-co-PAMEE), with a NLO chromophore incorporated into PAMME exhitits a high glass transition temperatrue of 131 deg C, as determined by DSC. The thin films of copolymers, which were cast on microscopic glass slides, were optically transparent, and the corona poled polymers produced relatively large and stable second harmonic generation (SHG) signals at room temperature. The nonlinear coefficent d_33 of the crosslinked copolymer containing 30 wt% PAMEE was 30.8pm/V. The SHG signal strength remained unchanged, even after 120 days, and exhibited excellent thermal stability at 65 deg C.