The influence of a weak stationary magnetic field on the kinetics of photovoltage decay in "solar" silicon crystals (solar-Si) with nanofilled polymer coatings is studied. The characteristic features of magneto-stimulated change of carrier lifetime depending on the concentration and the method of forming the nanofillers in the polymer matrix are established.

The results of investigating the effects of various fire retardants on the fire-resistance of epoxy urethane compositions are presented. It is shown that the simultaneous presence of phosphorus and bromine, as well as oxides and hydroxides, favors efficient coke formation and a reduction in combustibility while retaining the physicomechanical characteristics of an epoxy urethane adhesive.

Rheological properties of blends of amorphous and crystalline polymers were studied for a broad range of compositions and temperatures. It was established that below the melting pointT m the viscoelastic properties of blends of crystalline polymers are similar to those of polymers filled with mineral fillers. In both cases these properties are influenced by the existence, in such systems, of a temporary structural network formed by mineral or polymeric particles and its subsequent breakdown under the action of shear stresses. It was found that an anomalous decrease in the melt viscosity of the main component on addition of a small amount of a second polymer depended on deformation conditions. The comparison of data on viscoelastic properties and thermodynamic interaction between the components in the melt, estimated from the parameterχ23 of a new Flory theory, shows that the sharp drop of viscosity takes place in the region of microphase separation due to the appearance of an excess free volume in the interphase region. Calculation of the relaxation spectra for various blends also revealed marked changes when various amounts of a second component were added to the main polymer.

Viscoelastic properties of polymer blend melts of polystyrene–polycarbonate were investigated in a wide range of temperatures, frequencies, and compositions. It was established that the more essential changes in viscoelastic characteristics took place at small concentrations of one of the components and at low frequencies, probably because of a putting down of the slow relaxation processes. The marked decrease in the viscosity of the melts takes place in the region of phase separation due to thermodynamic incompatibility of the components and is in a good correlation with the appearance of excess free volume in the system.