Abstract
Carbazole-based bi-functional photorefractive polymers with controlled azo group content were prepared via a post-azo-coupling reaction. The polymers were characterized by IR, 1H NMR, UV–visible, DSC and GPC. Both IR and 1H NMR results proved that the azo group was attached to the polymer. As shown by UV–visible spectrum measurement, the azobenzene chromophore contents increased with extending the post-azo-coupling reaction time, and changed from 14% to 67% when the reaction time extended from 6 to 60 h. Molecular weight ( M w ) of the polymers can reach 2.5×10 4 as measured by GPC, which is much larger than the polymers with similar structure prepared by direct polymerization from the corresponding functionalized macromonomers. Glass transition temperature ( T g) of the polymers increased with the azobenzene chromophore contents.
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