Abstract: The crosslinking reaction of glycidyl monoether of 4-[(p-nitrophenyl)azo] phenol with biuret of hexamethylene diisocyanate has been carried out and investigated by DSC and FTIR techniques.A fully crosslinked nonlinear optical polymer was obtained in a short time, which has a good transparency and maximum absorption wavelength shorter than 400nm.The uniform films formed by spin coating of the THF solution onto transparent substrates were precured for 30 min at 85℃ before corona poling.The orientation and stability of the films were studied by UV-vis spectrum measurement.The orientation of the film decreased to 40% of the original in 4 days after poling for 1.5h at 85℃.However,no relaxation of the poled film was observed in 4 days after poling and crosslinking for 1h at 140℃.

Key words: rosslinked nonlinear optical polymer, glycidyl monoether, biuret