The azo chromophore anchored polyurethanes were synthesized by azo coupling of 4 nitrobenzenediazonium tetrafluoroborate and reacting the obtained 6 nitrobenzothiazole 2 diazoniun tetrafluoroborate with polyurethane i...The azo chromophore anchored polyurethanes were synthesized by azo coupling of 4 nitrobenzenediazonium tetrafluoroborate and reacting the obtained 6 nitrobenzothiazole 2 diazoniun tetrafluoroborate with polyurethane in dimethylforamide in the presence of HAc and its sodium salt. The polyurethanes were characterized by IR, UV Vis and 1H NMR spectra. The method has the advantages of simplicity and facility in preparing polyurethane NLO materials with different chromophores.展开更多
In order to improve the nonlinear optical property and stability of azo-dye chromophore, the nonlinear optical polyimide (NLOPI) attached with azo chromophore side chain is synthesized by diazo coupling reaction of 4-...In order to improve the nonlinear optical property and stability of azo-dye chromophore, the nonlinear optical polyimide (NLOPI) attached with azo chromophore side chain is synthesized by diazo coupling reaction of 4-nitrobenzenediazonium tetrafloroborate. The designed chemical structure of production can be proved in the infrared spectrum and ultraviolet-visible absorption spectrum. The NLOPI exhibited UV-Vis absorption of the azobenzene chromophore in the vicinity of the wavelengths of 330 and 490 nm. The broad amorphous peak proved that the NLOPI was amorphous with a little periodical structure along the side chain. According to transmission electron microscope, the NLOPI film was homogeneous. NLOPI only displayed a decrease in mass of about 5% at the temperature of 400 ℃ through thermogravimetric analysis.展开更多
A new kind of carbazole-based photorefractive polymer was prepared via a post-azo- coupling reaction. The structure of the polymer was characterized by IR, 1H NMR, UV-vis and GPC. The IR and UV-vis spectra demonstrate...A new kind of carbazole-based photorefractive polymer was prepared via a post-azo- coupling reaction. The structure of the polymer was characterized by IR, 1H NMR, UV-vis and GPC. The IR and UV-vis spectra demonstrated that azo group was grafted to the polymer in content of 15.56%. The molecular weight of the polymer as determined by GPC was higher than that of the polymer obtained by common method.展开更多
文摘The azo chromophore anchored polyurethanes were synthesized by azo coupling of 4 nitrobenzenediazonium tetrafluoroborate and reacting the obtained 6 nitrobenzothiazole 2 diazoniun tetrafluoroborate with polyurethane in dimethylforamide in the presence of HAc and its sodium salt. The polyurethanes were characterized by IR, UV Vis and 1H NMR spectra. The method has the advantages of simplicity and facility in preparing polyurethane NLO materials with different chromophores.
文摘In order to improve the nonlinear optical property and stability of azo-dye chromophore, the nonlinear optical polyimide (NLOPI) attached with azo chromophore side chain is synthesized by diazo coupling reaction of 4-nitrobenzenediazonium tetrafloroborate. The designed chemical structure of production can be proved in the infrared spectrum and ultraviolet-visible absorption spectrum. The NLOPI exhibited UV-Vis absorption of the azobenzene chromophore in the vicinity of the wavelengths of 330 and 490 nm. The broad amorphous peak proved that the NLOPI was amorphous with a little periodical structure along the side chain. According to transmission electron microscope, the NLOPI film was homogeneous. NLOPI only displayed a decrease in mass of about 5% at the temperature of 400 ℃ through thermogravimetric analysis.
文摘A new kind of carbazole-based photorefractive polymer was prepared via a post-azo- coupling reaction. The structure of the polymer was characterized by IR, 1H NMR, UV-vis and GPC. The IR and UV-vis spectra demonstrated that azo group was grafted to the polymer in content of 15.56%. The molecular weight of the polymer as determined by GPC was higher than that of the polymer obtained by common method.
