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; A., Barsella; A., Quatela. - In: MACROMOLECULAR CHEMISTRY AND PHYSICS. - ISSN 1022-1352. - STAMPA. - 208(17):(2007), pp. 1900-1907.
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.| File | Dimensione | Formato | |
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