Композиты и наноструктуры COMPOSITES and NANOSTRUCTURES

V.V.Vasiliev, S.A. Lurie

APLANE PROBLEM OF THE THEORY OF ELASTICITY FOR A CANTILEVER

STRIP WITH MICROSTRUCTURE................................................................................................................................................. 63

The equations of the theory of elasticity for solids with microstructure obtained in [1,2] are applied to the plane problem for a cantilever strip which has a singular solution in the classical elasticity [3,4]. The theory which takes into account the solid microstructure allows us to eliminate the singularity of the classical solution. The obtained solution in conjunction with experimental study of composite beams is used to determine the microstructural parameter which enters the equations of the proposed theory. The correspondence between the obtained solution and the traditional Strength of Materials solution is discussed (p. 63-76; fig. 6).

A. I.Oleinikov

ESTIMATE OF STIFFNESS AND STRENGTH OF LAMINATED COMPOSITES ................................................................ 77

The approximate design model of laminated fiber-reinforced composites is developed. In this model might be supposed that the layers are in tension - compression only and that the modulus and strength are functions of sign longitudinal stress in stiffness tensor of layer. In the general case the symmetrical balanced composite is monoclinic material and extension - shortening and angular distortions are coupling. Failure sequences of CFRP layers are shown (p. 77-79).

T.T. Khachatryan, H.A.Matnishyan and G.H.Minasyan

SYNTHESIS OF POLYANILINE/TITANIUM DIOXIDE NANOCOMPOSITES..................................................................... 80

A study of aniline oxidation by ammonium persulfate in acidic aqueous media in the presence of TiO₂ was carried out. An influence of TiO₂ on the reaction rate, features of aniline polycondensation and molecular weight of a resulting polymer was studied. Nanoscale conductive composites of polyaniline with titanium dioxide (PAni/TiO₂) obtained by several methods were investigated, as well as first was proposed a method for obtaining PAni/TiO₂from titanium tetraethoxide in situ. The proposed methods allow to obtain nanocomposites with a core of TiO₂ and polyaniline shell, as well as to regulate the content and particle sizes of TiO₂ from 10 to 100 nm in nanocomposites in dependence on the selected conditions of synthesis - temperature, pH medium and concentration of reagents (p. 80-91; fig. 6).

T.T. Khachatryan, H.A. Matnishyan and G.H. Minasyan

SYNTHESIS OF POLYANILINE/TIN DIOXIDE NANOCOMPOSITES................................................................................... 92

A study of aniline oxidation by ammonium persulfate in acidic aqueous media in the presence of SnO₂ was carried out. An influence of SnO₂ on the reaction rate and features of aniline polycondensation was studied. Nanoscale composites of polyaniline with tin dioxide (PAni/SnO₂) were investigated. Polycondensation of aniline and synthesis of its nanocomposites with SnO₂ combined in a single reactor. Proposed in situ method allows to obtain nanocomposites with a core of SnO₂ and shell of polyaniline, as well as to adjust the content and particle sizes of SnO₂ from 10 to 100 nm in nanocomposites, in dependence on the selected conditions of synthesis - temperature, pH medium and concentration of reagents (p. 92-101; fig. 5).

B. N.Fedulov, A.A.Saonov, M.M Kantor, S.V.Lomov

MODELING OF THERMOPLASTIC COMPOSITES SOLIDIFICATION AND ESTIMATION

OF RESIDUAL STRESSES................................................................................................................................................................. 122

This research considers the manufacturing of thermoplastic composites. The main aspect of research is the modeling of phase transition of thermoplastic matrix material, taking into account changes in mechanical properties and additional shrinkage due to chemical reactions. Equations for modeling of all key processes related to temperature cycle of the thermoplast solidification are provided with corresponding material constants based on polyether ether ketone (PEEK) (p. 102-122; fig. 13).