Yakovlev Y. Percolation properties of systems based on oligooxyalkylenglycols and carbon nanotubes.

The object of the research is percolation phenomenon in polymer nanocomposites. The research purpose was the establishment of mechanisms of percolation transition in systems based on polypropylene glycol and polyethylene glycol filled with carbon nanotubes. The main results were obtained by means of dielectric relaxation spectroscopy, optical microscopy and wide angle X-ray scattering. In this work a behavior of systems oligooxyalkylenglycol/carbon nanotubes near percolation threshold was studied. The influence of matrix crystallinity, preparation conditions, and modifiers on percolation behavior was investigated. The accordance between experimental data and scaling equations in the percolation transition region was shown. Critical exponents that lower than theoretical ones was determined. The decreasing of percolation threshold from 0,0024 to 0,0015 with increasing of the matrix crystallinity of PEGs was shown. Changing of the percolation thresholds and structure of filler aggregates for different regimes of matrix/filler mixing was demonstrated. The incorporation to the oligooxyalkylenglycol matrices of a LiClO4 modifier leads to decreasing of the percolation threshold for amorphous matrices and the increasing for crystalline ones. Addition of an organomodified laponite leads to decreasing of the percolation threshold from 0,002 to 0,0009 in the PPG/carbon nanotubes system.