In situ solid state polymerization and characterization of poly (N-vinylcarbazole) encapsulated Keggin type polyoxometalate nanocomposite

In situ solid state polymerization method was performed with mixtures of polyoxometalate (POM) and N-vinylcarbazole (NVC) in desired weight ratios for the synthesis of nanocomposites. The yield of the PNVC–H4SiW12O40 nanocomposite increased with increasing amount of H4SiW12O40 as well as with [H4SiW12O40]/[PNVC] loadings. The formation of PNVC in the system was endorsed by FTIR, UV–vis, and 1H1 NMR spectroscopic analyses. HRTEM studies revealed that the PNVC–H4SiW12O40 nanoparticles have an average grain size of 62.13 nm and that the H4SiW12O40 nanoparticles are fairly well-dispersed in the composite matrix. SEM analysis shows the presence of agglomerates of nano particles embedded in the matrix. AC conductivity (σac)–frequency variation was constant for PNVC but showed an increasing trend with higher H4SiW12O40:PNVC weight ratios in the composite.