  We study the aggregation of carbon allotrope nanofillers in the matrix of
isotactic polypropylene with direct small-angle neutron scattering
measurements. With the ATSAS software, we analyzed the data and determined the
fractal shape, dimension, and sizes of nanofiller aggregation in the bulk of
isotactic polypropylene over the range of the scattering angles. We estimated
the volume distributions and aggregation of different types of carbon
nanofillers at different concentrations: nanographite, graphene nanoplatelets
(GNP), single-walled carbon nanotubes (SWCNT), multi-wall carbon nanotubes
(MWCNT), binary fillers MWCNT/GNP and fullerenes. We reconstructed the shape of
nanoscale aggregates of all nanofillers and found that the systems are
polydisperse; nanofillers associate in the volume of iPP as fractal dense
aggregates with rugged surface, their sizes exceeding original dimensions of
nanofillers several times.
