Novel photochromic composite films have been successfully fabricated by dispersing pyrazolone derivative：1,3-Diphenyl-4-（3-chlorobenzal）-5-hydroxypyrazole 4-phenylsemicarbazone（la） into hydrosol of polyvinyl alco...Novel photochromic composite films have been successfully fabricated by dispersing pyrazolone derivative：1,3-Diphenyl-4-（3-chlorobenzal）-5-hydroxypyrazole 4-phenylsemicarbazone（la） into hydrosol of polyvinyl alcohol（PVA）.The microstructure,photochromic behaviors and thermal bleaching properties were investigated by Raman spectroscopy,X-ray powder diffraction（XRD）,field emission scanning electron microscopy（FE-SEM） and ultraviolet-visible absorption spectroscopy（UV-vis）.The results showed that la was not only blended but also well dispersed in the PVA polymer films with a suitable content of chromophore.Upon UV light irradiation,the composite films gradually changed from colorless to yellow and recovered fully to the initial state upon thermal bleaching.The time constants of photochromic reactions were almost the same as those of la observed in their crystalline state,indicating that the photochromic phenomenon is barely disturbed by the polymer matrix.展开更多
基金supported by the National Natural Science Foundation of China (Nos. 21262038, 21571152 and U1203292)National 973 Program on Key Basic Research Project of China (No. 2014CB660805)the Outstanding Youth Natural Science Foundation of Xinjiang Uygur Autonomous Region of China (No. 201311006)
文摘Novel photochromic composite films have been successfully fabricated by dispersing pyrazolone derivative：1,3-Diphenyl-4-（3-chlorobenzal）-5-hydroxypyrazole 4-phenylsemicarbazone（la） into hydrosol of polyvinyl alcohol（PVA）.The microstructure,photochromic behaviors and thermal bleaching properties were investigated by Raman spectroscopy,X-ray powder diffraction（XRD）,field emission scanning electron microscopy（FE-SEM） and ultraviolet-visible absorption spectroscopy（UV-vis）.The results showed that la was not only blended but also well dispersed in the PVA polymer films with a suitable content of chromophore.Upon UV light irradiation,the composite films gradually changed from colorless to yellow and recovered fully to the initial state upon thermal bleaching.The time constants of photochromic reactions were almost the same as those of la observed in their crystalline state,indicating that the photochromic phenomenon is barely disturbed by the polymer matrix.
