S. Kh. Tabarov

X-ray diffraction analysis of C60 fullerene powder and fullerene soot

C60 fullerene powder and fullerene soot are examined by the method of small-angle X-ray diffraction. Small-angle diffraction patterns constructed in the Guinier coordinates make it possible to find the radii of inertia of scattering elements. The small-angle diffraction scattering findings agree well with large-angle X-ray diffraction data.

Effect of C60 fullerene additives on the thermal conductivity of poly(methyl methacrylate) films

The thermal conductivity of a composite comprising C60 fullerene particles dispersed in a poly(methyl methacrylate) (PMMA) matrix exhibits a significant decrease, even at small concentrations of the fullerene. It is concluded that the main factor that determines this behavior is a decrease in the mean free-path length of phonons, which is caused by increasing inhomogeneity of the material and growing number of the scattering centers.

Concentration-dependent variations in the density of C60 fullerene solutions in aromatic solvents

The densities of C60 fullerene solutions in benzene, toluene, and p-xylene have been determined by pyknometry and studied as a function of the fullerene concentration in solution. All dependences exhibit a non-monotonic character, whereby the density initially decreases, passes through a minimum, and then grows with increasing fullerene concentration. The position of the minimum shifts toward greater C60 concentrations on the passage from benzene to toluene and p-xylene.

Structurization of a solvent interacting with fullerene C60

Solutions of fullerene C60 in toluene and p-xylene were investigated by small-angle X-ray diffraction. In all small-angle scattering curves, the scattering intensity decreases to constant value IC with an increase in the scattering angle. The value of IC nonmonotonically depends on the fullerene concentration. The radii of gyration of scattering elements were determined by constructing small-angle X-ray diffraction patterns in Guinier coordinates.

Effect of C60 fullerene additives on the structure and mechanical properties of thin organic glass films

We have studied the effect of small additives of C60 fullerene on the mechanical properties (strength, Young’s modulus, elongation at break) of thin organic glass films tested for uniaxial extension.

Effect of C60 fullerene on the boiling point of its solutions in some aromatic solvents

Concentration dependences of the boiling points Tbexp of C60 fullerene solutions in four aromatic solvents were determined. For benzene and p-xylene, processing of the increasing dependence in terms of the Raoult law enabled estimation of the cooperativity parameters of the interaction between fullerene and solvent molecules.

Effect of C60 fullerene additives on the mechanical properties of low-density polyethylene films

We have studied the effect of C60 fullerene additives on the mechanical properties (strength, Young’s modulus, elongation at break) of thin low-density polyethylene films tested for uniaxial extension.

Effect of multiwalled carbon nanotubes on tensile stress-strain diagrams of amorphous-crystalline thermoplastic polymers

The effect of multiwalled carbon nanotubes (MWNTs) on the stress-strain diagrams of uniaxially extended thin films of low-density polyethylene (LDPE) and poly(vinyl alcohol) (PVA) has been studied. MWNTs were synthesized by the thermocatalytic method. The introduction of MWNTs decreases the plasticity of LDPE, while significantly increasing that of PVA. The results can be explained by assuming that crystallites are key structural elements that ensure large plastic deformation. The manifestation of the plasticity of crystallites implies that amorphous regions occur in a rubberlike state. Both of these prerequisites are important for the mechanics of amorphous-crystalline thermoplastic polymers.

Small-angle X-ray scattering study of the structure of powder fullerene C60 and fullerene soot

Powder samples of fullerene C60 and fullerene soot have been studied by the small-angle X-ray scattering method. The radii of gyration of scattering elements have been determined by constructing small-angle diffraction patterns in Guinier coordinates. The data obtained agree well with the results of wide-angle X-ray scattering study, the available data on the structure of the powder fullerene C60 prepared by the Huffman-Krätschmer technique, and the structure of the C60 molecules. Conglomerates of two C60 molecules, along with crystallites ∼20 nm in size that are distributed in an amorphous matrix, are present in fullerene powders. Fullerene soot contains C60 crystallites 20–25 nm in size and graphite crystallites ∼2–3 nm in size that are distributed in an amorphous matrix.

Effect of fullerene C60 on the melting point of p-xylene

The dependence of the p-xylene melting point on the concentration of fullerene C60 dissolved in it was determined.