THE MECHANICAL CHARACTERISTICS OF THE THERMAL EXPANSION GRAPHITE-MULTI-WALL CARBON NANOTUBES COMPOSITES

摘要

Carried out by us researches of several nanocomposites showed that the introduction of multi-walled carbon nanotubes (MWCNT) in the polymer, liquid metal, ceramic matrixes influenced on the supramolecular organization, in particular, the degree of crystallinity of filled polymers (y) (Fig. 1), which is a nonmonotonic function of nanotubes concentration [1]. The system of liquid selenium-50% vol. MWCNT solidifies almost completely into amorphous structure, in contrast to the polycrystalline structure in the absence of MWCNT. The introduction of MWCNT in an amount up to 1% wt. into hydroxyapatite at the synthesis stage orders the porous structure of matrix. Structural features clearly manifest in the concentration range up to and in the percolation threshold. Reinforcement by MWCNT leads to an increase in strength properties, particularly yield strength and elastic modulus of composite PTFE-4 (F4) / 15% MWCNT increased by 2-3 times, its wear resistance increased by 100-200 times, abrasion of elastomer decreased by more than 3 times with partial replacement of carbon black on the MWCNT. MWCNT-filled rubbers have significantly increased resistance to solvents, oil, petrol and mineral acids.