Azobenzene-modified pullulan with different substitution degrees were prepared by changing feed molar ratio of 4-phenylazophenyloxybutyrate acid to pullulan. The structure of the modified pullulan were characterized b...Azobenzene-modified pullulan with different substitution degrees were prepared by changing feed molar ratio of 4-phenylazophenyloxybutyrate acid to pullulan. The structure of the modified pullulan were characterized by 1 H NMR and FTIR spectroscopies. The substitution degrees were determined by elemental analysis and UV-Vis spectra. Photochromism property in solution was investigated by UV-Vis spectroscopy, isomerization behavior of azobenzene moeties of polymer under irradiation at 350 nm is obvious. After 4 min irradiation, trans isomer of sample 3 change into cis isomer completely. Furthermore, unlike pullulan, which is soluble only in H2O or DMSO, the solubility of these products in common organic solvent increased greatly.展开更多
Photodynamic polymers,possessing interesting properties such as surface relief gratings among others,have attracted considerable attention in recent years and are promising for information industries such as data stor...Photodynamic polymers,possessing interesting properties such as surface relief gratings among others,have attracted considerable attention in recent years and are promising for information industries such as data storage.However,the relationship between the degree of functionalization and properties of photodynamic polymers has not been thoroughly investigated yet.Two kinds of azo photodynamic polymers with different degree of functionalization were synthesized by post azo coupling reactions. T gs of photodynamic polymers increase as the degree of functionalization increasing.The polymers synthesized exhibit significant photodynamic behavior.展开更多
文摘Azobenzene-modified pullulan with different substitution degrees were prepared by changing feed molar ratio of 4-phenylazophenyloxybutyrate acid to pullulan. The structure of the modified pullulan were characterized by 1 H NMR and FTIR spectroscopies. The substitution degrees were determined by elemental analysis and UV-Vis spectra. Photochromism property in solution was investigated by UV-Vis spectroscopy, isomerization behavior of azobenzene moeties of polymer under irradiation at 350 nm is obvious. After 4 min irradiation, trans isomer of sample 3 change into cis isomer completely. Furthermore, unlike pullulan, which is soluble only in H2O or DMSO, the solubility of these products in common organic solvent increased greatly.
文摘Photodynamic polymers,possessing interesting properties such as surface relief gratings among others,have attracted considerable attention in recent years and are promising for information industries such as data storage.However,the relationship between the degree of functionalization and properties of photodynamic polymers has not been thoroughly investigated yet.Two kinds of azo photodynamic polymers with different degree of functionalization were synthesized by post azo coupling reactions. T gs of photodynamic polymers increase as the degree of functionalization increasing.The polymers synthesized exhibit significant photodynamic behavior.