A new equation of the interfacial tension isotherm at the flat interface between solid solution and liquid solution is obtained in an exact and approximate form. Calculations of the interfacial tension, thermodynamic activities of the components, and the composition of the interfacial layer for the binary In-Pb system for two temperatures are carried out.

The paper investigates perturbations in inhomogeneous systems. Formulas for the response of an inhomogeneous electron gas in weak external fields are obtained.

The deformation and strength properties of composites based on ultrahigh molecular weight polyethylene and dispersed fillers are investigated. Dispersed particles of kaolin, aluminum and aluminum hydroxide, different in shape and nature, were used. It is found that the best complex of mechanical properties of composites processed by plunger extrusion of powder billet is achieved by using anisotropic filler particles with a high degree of adhesive interaction with the polymer matrix. It is established that by changing the filler concentration, it is possible to obtain the necessary combination of strength and deformation charac- teristics in polymer composites.

The behavior of polyimide with different porosity under strong shock-wave pulsed compression is in- vestigated. Shock adiabats and diagrams of the state of polyimide with varying degrees of porosity from the mass velocity are given; shock adiabats of the same polyimide samples in D-u coordinates.

The paper presents a model of dispersion interactions. Multipole constants for atoms of inert gases are calculated.

A quantitative method for determining the content of neodymium in aqueous solutions using UV- visible spectrophotometry has been developed. The results showed that the developed method has high accuracy and reliability in determining the content of neodymium in a liquid. It is concluded that the developed method can be used for quantitative analysis of the content of neodymium in various solutions.

The conditions of transfer of applied to sample of nanocomposite polymer/organoclay mechanical stress from polymeric matrix to nanofiller were studied. It has been shown that efficiency of transfer is defined by degree of nanofiller aggregation, which can be estimated as number of organoclay separate plate- lets per one aggregate (tactoid). The last parameter depends on existence of binding agent. The effective (re- al) elasticity modulus of nanofiller is function of efficiency of applied stress transfer and is independent on nanofiller elasticity modulus actually.

Economical factorized schemes for third-order pseudoparabolic equations with artificial viscosity are considered. On the basis of the general theory of stability of difference schemes, the stability of the initial data and the right part is proved. A numerical experiment was carried out.

The paper proposes a new, improved method for obtaining polymers obtained in solution by the method of high-temperature non-equilibrium polycondensation. The method allows you to quickly monitor the progress of the polycondensation reaction, using the physical parameters of side, low molecular weight re- action products.

The reactions of solid-phase polycondensation of samples of secondary polyethylene terephthalate from various manufacturers have been studied. The dynamics of changes in the rheological properties of solutions of secondary polyethylene terephthalate before and after the polycondensation process has been determined.

A review of the literature on known methods for the production of polyether ether ketane and composites based on it, used in medical practice for the manufacture of implants, is presented. The main substances used in the synthesis of PEEK, as well as modifiers included in the composite material based on PEEK, are summarized.

Simple aromatic polyetherimides not previously described were obtained by the interaction of 1,3-bis-(pnitrophenyl-3,4-phthalimide)-1,1,3,3-tetra-methyldisiloxane with bisphenols containing dichloroethylene and carbonyl groups between phenyl nuclei. The effect of the introduced tetramethyldisiloxane, dichloroethylene and carbonyl groups on solubility, heat and heat resistance, film-forming properties of synthesized polymers has been studied.

The synthesis and properties of polyarylene oxides, aromatic polyesters based on trypticendiol-2,5, are considered. It has been shown that polyarylene oxides of trypticendiol-2,5 have higher characteristics compared to the prop- erties of similar polymers based on the common bisphenol A. It has been established that polyarylene oxides of trypticendiol-2,5 have a number of specific properties important from a practical point of view related to the unique structure of trypticene.

The new parameter was introduced, which characterizes quantitatively dispersion degree of filler in polymeric matrix of composite. The obtained on this basis percolation relationship shows at determination of reinforcement degree that in the case of fixed content of filler the indicated parameter is defined by dispersion degree only. A parameter, controlling dispersion degree of filler in matrix of polymer composites, were estimated.