Journal of Industrial and Engineering Chemistry, Vol.11, No.6, 852-856, November, 2005
Soluble High-Tg Polymers Containing Disperse Red Chromophore that Display Nonlinear Optical Activity
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We have synthesized NLO polymers containing azobenzene moieties connected by imide linkages or urethane linkages. The intensity of the second harmonic generation (SHG) signal from spin-cast films of these polymers were 2 to 14 times higher than that from Y-cut quartz. The highest SHG intensity was obtained in PU-DR19 because of the flexible urethane linkages (14 times that from Y-cut quartz). PI-1-DR19 also showed a high SHG (10 times that from Y-cut quartz), but a smaller one than that in PU-DR19. Among the polymers synthesized in this work, the polymers containing urethane linkages showed higher-intensity second harmonic signals than did those possessing imide linkages because of the former's higher flexibility. The values of Tg of the polymers were in the range 140~158 ℃; the 10% weight loss temperatures appeared in the range 290~320 ℃. PU-S-DR19 showed a higher value of Tg than did DU-DR19 because of its spiroacetal moiety. All of these polymers were readily soluble in common organic solvents, such as chloroform, NMR, and DMF.
Keywords:nonlinear optical polymer;second harmonic generation;polyurethane;polyimide;spiroacetal moiety
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