Photoconductivity and structural characterization of fullerenated PVKBr polymer

The influence of chemical modification (fullerenation) on structure and photoconductivity in brominated poly(N-vinylcarbazole)(PVKBr) has been described. The characterization techniques employed are UV-Visible, FT-IR, TGA, DTG, C-13 CP/MAS NMR, XRD and SEM. The fullerenated PVKBr has a visibly deep-brownish yellow cast when compared with the unreacted polymer. PVKBr. Its UV-Visible absorption spectrum, in which the main bands center at 191, 195, 215, 229, 240, 265, 297, 331 and 345 nm, tends to move to the longer wavelength in compared that of the PVKBr and the peak range also extended from about 300 to 860 nm. The X-ray diffraction evidence indicated that X-ray diffraction structure of fullerenated PVKBr differs greatly from that of PVKBr arising from the covalent attachment of C-60 to the brominated PVK backbone. The decreased photogeneration efficiency of fullerenated PVKBr might be thus linked to this conformational complication. The photo-induced discharge of pure PVK, PVKBr, C-60-PVK, and C-60-PVKBr are found qualitatively in the following order: 3.85% C-60-PVK >> PVKBr > 3.85%C-(60)-PVKBr > pure PVK under the same experimental conditions. Copyright (C) 1996 Elsevier Science Ltd