Synthesis and dielectric characterization of –COOH functionalized MWCNT filled PMMA nanocomposites

Manasi Singhi; Narender Singh Rawat; M. Fahim

Volume : IV, Issue : X, October - 2015

Synthesis and dielectric characterization of –COOH functionalized MWCNT filled PMMA nanocomposites

Manasi Singhi, Narender Singh Rawat, M. Fahim

Abstract :

A series of COOH functionalized multiwalled carbon nanotubes (MWCNT) filled polymethylmethacrylate (PMMA) nanocomposites was prepared in the laboratory. The concentration of MWCNT (<3 wt%) was changed in the step of 0.50 wt.% and nanocomposites were prepared by in–situ polymerization of MMA monomer followed by compression moulding. Frequency and temperature dependent dielectric behavior of these nanocomposites were studied to investigate the influence of a polar group functionliased CNT inclusion in a polar polymer (PMMA). It was observed that at all temperatures and frequencies dielectric constant of pure PMMA decreased with low wt% of CNT and then increased with further increase in CNT loading. At room temperature, composite with 1.50wt% of CNT showed a minimum value of dielectric constant at all frequencies. Secondly with increasing temperature dielectric constant increased till it reached glass transition temperature (Tg) and then decreased with further increase in temperature.