New polyurethanes containing Y-shaped chromophores, symmetrical derivatives of 4-(dicyanomethylene)-2-methyl-6-[p-(dimethylamino)styryl]-4H-pyran, have been prepared. The polymers show high glass transition temperatures (Tg) and a good thermal stability. SHG measurements on poled polymer films of the synthesized polymers have been carried out and a maximum d33 of 15 pm_ V_1 has been found at 1 368 nm fundamental wavelength. Time stability measurements on the most active polymer have shown that after the initial fast relaxation, the d33 value remains constant at 80 °C for 60 d.

NLO behavior of polymers containing Y-shaped chromophores.

CARELLA, ANTONIO;BORBONE, FABIO;CARUSO, UGO;CENTORE, ROBERTO;ROVIELLO, ANTONIO;
2007

Abstract

New polyurethanes containing Y-shaped chromophores, symmetrical derivatives of 4-(dicyanomethylene)-2-methyl-6-[p-(dimethylamino)styryl]-4H-pyran, have been prepared. The polymers show high glass transition temperatures (Tg) and a good thermal stability. SHG measurements on poled polymer films of the synthesized polymers have been carried out and a maximum d33 of 15 pm_ V_1 has been found at 1 368 nm fundamental wavelength. Time stability measurements on the most active polymer have shown that after the initial fast relaxation, the d33 value remains constant at 80 °C for 60 d.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11588/201172
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