  Conducting polymers have wide technological applications in sensors,
actuators, electric and optical devices, solar cells etc. To improve their
operational performance, mechanical, thermal, electrical and optical
properties, such polymers are doped with carbon allotrope nanofillers.
Functionality of the novel nanocomposite polymers may be stipulated by size
characteristics of nanoparticles and the polymer, different physical effects
like charge transfer in such objects etc. We characterize and analyze
structure, elastic, electric properties and of novel polymer nanocomposites,
isotactic polypropylene (iPP) with high crystallinity, doped with graphene
nanoplates (GNP) and nanographite particles at different concentrations and
sizes about 100 nm, basing on the results of dynamic mechanical analysis (DMA),
dielectric spectroscopy, small-angle neutron scattering (SANS) and theoretical
modeling. Carbon NPs aggregated in fractal objects in the bulk of iPP change
its mechanical plastic, elastic and electric properties comparing with pristine
polymer. We study modification of nanofiller morphology with the concept of
Cosserat elasticity which involves description of the behavior of linear
topological defects caused aggregation of nanographite and GNPs. We supply our
experimental data with numerical simulations on the lattice in frames of the
model of Cosserat elasticity to estimate some mechanical characteristics of the
whole composite iPP.
