交联型非线性光学聚合物的合成

Synthesis of Cross-Linked Second Order Nonlinear Optical Poled Polymer

利用六亚甲基二异氰酸酯的缩二脲与对硝基偶氮苯甘油单醚的电场极化交联反应合成交联型聚合物非线性光学材料．采用变温红外光谱、ＤＳＣ、紫外可见吸收光谱研究交联反应时间对非线性生色基团的取向及松弛的影响．

The crosslinking reaction of glycidyl monoether of 4-[(p-nitrophenyl)azo] phenolwith biuret of hexamethylene diisocyanate has been carried out and investigated by DSC andFTIR 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 substrateswere precured for 30 min at 85℃ before corona poling.The orientation and stability of thefilms were studied by UV-vis spectrum measurement.The orientation of the film decreasedto 40%of the original in 4 days after poling for 1.5h at 85℃.However,no relaxation of thepoled film was observed in 4 days after poling and crosslinking for 1h at 140℃.