Investigation of the effect of active diluents on the molecular mobility and topology of cross-linked amine epoxy-adamantane polymers

Using the framework of the concepts about the nature of large-scale mobility of kinetic units, the interconnection between kinetic and structural heterogeneity of molecules of the epoxy polymers based on diglycidyl ester of diphenylolpropane cured with diaminomethyladamantane upon dilution with monofunctional reactive compounds is studied by the example of phenylglycidyl ester. The possibility of controlling the changes in structural heterogeneity of the polymers is shown, which is important for achieving optimal properties of novel materials under development (adhesives, sealants, and so on).     

Dependence of physicomechanical strength and peculiar features of deformation of fiberglass, organic, and carbon-fiber epoxy-polymer composite materials on winding conditions

The article discusses peculiar features of deformation on winding epoxy-polymer fiberglass, organic, and carbon composites. The stiffness properties of the materials are determined as a function of winding conditions with regard to achieving the “shape memory” effect in fiber-filled heat-shrinkable couplings.     

The Effect of Hollow Corundum Microspheres on the Properties of Materials Based on Carbon-Chain Rubbers

The effect of hollow corundum microspheres on the properties of a rubber mixture based on a combination of carbon-chain rubbers was studied. Owing to the formation of a cross-linked structure of microspheres with a rubber matrix and its additional structuring with Hexol KhPI adhesion modifier, it was shown that it is possible to increase the physicomechanical characteristics and the heat and fire resistance of rubber by establishing the optimal microsphere content in it.     

Conoscopic figures of optically active uniaxial crystals

Conoscopic figures of optically active crystals are described by the formulas for the intensity of light transmitted by a plate located between arbitrarily oriented polarizer and analyzer. The differences in the behavior of optically active and inactive crystals and also of right-and left-handed crystals are established. The corresponding computations and the simulation of conoscopic figures are performed using the Mathematica-4.1 package of computer programs.     

The use of discrete dyadic wavelets in image processing

In this paper, using the discreteWalsh transform, we construct orthogonal and biorthogonal wavelets for complex periodic sequences similar to those studied earlier for the Cantor group. Results of numerical experiments demonstrate the effectiveness of the use of constructed discrete wavelets in image processing.     

Determination of the parameters of relaxation processes in epoxy-allyl interpenetrating polymer networks with a high degree of interpenetration

The effect of the ratio of the components of epoxy-allyl polymers and curing sequence on the transformation degree and vitrification temperature of polymers has been studied. The parameters of the relaxation processes during the formation of epoxy-allyl polymers with a high interpenetration degree have been determined by the method of electret-thermal analysis.     

A study of molecular mobility and relaxation properties of epoxy-allyl polymers during formation of interpenetrating polymer networks under conditions of the phase separation of the networks

Molecular mobility and relaxation properties of epoxy-allyl polymers (EAPs) and features of the formation of interpenetrating polymer networks under conditions of the phase separation of the network have been studied. The presence of the extensive interphase zone between the individual epoxy and allyl component networks has been established. The segregation degree has been calculated taking into account the volume fractions of the components of the polymer mixture. The interrelation between the features of the structure of the obtained EAP with a high level of adhesion and deformation-strength characteristics of polymers in glassy and highly elastic states has been demonstrated.     

Bethe equations “on the wrong side of the equator”

The T-Q Baxter equations for the XXX (XXZ) spin chain are analyzed. For each polynomial (trigonometric) solution of degree not exceeding N/2, which provides a solution of the Bethe ansatz equations, there exists a second linearly independent polynomial solution of degree greater than N/2. This second solution plays an essential role; in particular, all fusion relations follow from these two solutions. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 118, No. 3, pp. 452–461, March, 1999.