SELF-CROSS-LINKABLE SIDE-CHAIN COPOLYMER FOR NONLINEAR-OPTICAL APPLICATION

2-Tetrahydropyranyl methacrylate with a self-crosslinkable moiety was copolymerized with methyl methacrylate and (2-methacryloxyethyl)methyl amino]-4'-nitrostilbene or 2-methacryloxyethyl)ethylamino]-4'-nitroazo benzene to provide second-order nonlinear optical property. Glass tran sition temperatures (T-g) of the copolymers are around 140 degrees C. The copolymers were soluble in common organic solvents such as tetrahy drofuran (THF), cyclohexanone, and N,N-dimethylformamide (DMF). Poling was carried out at 140 degrees C for 20 min and identified with UV-Vi s spectroscopy. Electro-optic coefficient (r(33)) of copolymer was 62 pm/V for polymer 2 at 633 nm, and relaxation did not remarkably occur due to the formation of a crosslinked network at 200 degrees C for 15 min.