Design And Synthesis Of New Azobenzene Photoelectric Materials

A series of photosensitive multifunctional monomers containing azobenzene moieties have been designed and synthesized,after which azobenzene-functional polymers were obtained by reaction with the above monomers.We synthesized 4,4'-dihydroxy-azobenzene?ABP?,4-hydroxyhexyloxy azobenzen-e?H6AAB?and 4,4'-6-hydroxyhexyloxy azobenzene?ABDH6?which hydroxy as azo basic unit.The structure and photoisomerization of the monomers were characteriz-ed by infrared spectroscopy?IR?,nuclear magnetic resonance spectroscopy?¹H-NM R?,differential scanning calorimetry?DSC?and UV-visible spectrum?UV-Vis?.The next part of the works focus on the thermal performance and the photoresponsive of acrylic azobenzene-functional polymers.First we composed diacrylic azobenzene crosslinking monomers,4,4'-bis-acrylate-yl-azobenzene?ABME?,4-acrylic ester-yl hexyloxy azobenzene?A6AAB?and 4,4'-bis-[?acrylic-n-ester-yl?-n-alkoxy]azobenzene?ABDMEn?.Structures and properties of monomers were characterized by IR,¹HNMR,DSC and UV-Vis.We then synthesized a series of photoresponsive PS?O-PS,OA6-PS and OD6-PS?containing different content of monomers by solution polymerization.IR and¹H-NMR were used for structural analysis,DSC and TGA were utilized in thermal analysis,and UV-Vis was used for photo response properties of such polymers.Experiments shows that the O-PS,OA6-PS and OD6-PS samples so obtained can be dissolved in common organic solvents such as THF,thus proving that it possesses a linear structure.Experiments on examining its thermal properties shows that the T_g values and the initial decomposition temperature of these polymers increased with the rising of the azobenzene concentration.Results from UV-Vis experiments shows that isomerization of such polymer solution could be initiated by both light and heating.In the third part,we obtained the 4,4'-the diglycidyl ether azobenzene?ABDE?and4-phenylazophenylglycidylether?ABE?byepoxidation,azobenzeneamino compounds?ABDEA?and water-soluble azobenzene.PEG?PEGA,PEGD?was obtained by trimethylethylenediamine and methoxypolyethylene glycol amine reacting with ABE and ABDE.Then fluorescent polystyrene microspheres containing fluorescence azobenzene complexes?ABDEZ?which was obtained by ABDEA and ZnCl₂ was synthesized by in situ dispersion polymerization.structures,fluorescence properties and photoisomerization phenomenon of all monomers and polymers were characterized by IR,¹H-NMR,¹H-NMR,fluorescence spectrophotometer and SEM.ABDEA,ABDEZ,PEGA,PEGD and the azobenzene microspheres were not reported in previous literatures.