Development of polyurethane multiwall carbon nanotubes (MWCNTs) novel polymeric nanodielectric material

• Crystallinity of PU decreases due to incorporation of MWCNTs.
• Dielectric properties of nanodielectric are consistent with percolation theory.
• UV–Vis shows energy band gap does not affected by increasing wt% of MWCNTs in PU.

Polyurethane/multi-walled carbon nanotube nanodielectric thin films of 25 μm thick were prepared by solution grown method. The microstructure of the nanodielectric was examined by scanning electron microscopy. The MWCNTs are observed to be dispersed in PU matrix well apart from a few of clusters. The MWCNTs/polymer nanodielectrics characterized with decrease in energy band gap and crystallinity. The analysis of dielectric properties of the composite samples of different weight ratio was studied by measuring the permittivity and tangential loss at room temperature. The frequency dependent permittivity obeys the percolation theory. Further, it has been observed that the dielectric properties of PU and PU nanodielectric are unaffected by UV-irradiation. XRD characteristics confirm the formation of PU/MWCNTs nanodielectrics.