The formation and failure of the adhesive joints between polycarbonate and the copolymers of butadiene with styrene have been studied. The data on the phase equilibrium, diffusion processes and the structure of the transition zone have been obtained. The influence of the composition of components and the temperature-time formation conditions on the strength of an adhesive joint has been considered.

Structure of graft copolymers of PA-6 with polymethacrylic acid obtained by chemically initiated liquid-phase graft polymerization has been studied by electron microscopy, electron-probe microanalysis, contrasting and etching methods. The concentrational profiles of the graft polymer distribution along the fiber cross-section, coefficients of diffusion of monomers solutions have been determined and compared with kinetics of permeation of the grafted layer inside the polymer matrix. The concentrational profile of the grafted polymer distribution has the steep character. Grafting proceeds both in the interfibrillar space and on the surface of a fiber. The heterogeneous character of the grafted layer structure is shown, the segregated phase of grafted acid is a dispersive medium, the PA-6 inclusions are a dispersed phase.

The methods of successive interval sorption and microcalorimetry have been used to determine the mean Gibbs mixing energies Δgx and the mean mixing enthalpies Δhx of PVC with the statistical copolymers of vinyl chloride and vinyl acetate of different composition. The mixing entropies Δsx have been calculated. PVC mixes to a limited degree with each of the copolymers. With rise in the content of the vinyl chloride units in the copolymer and rise in temperature the region of mutual solubility increases. Mixing of PVC with the copolymers is accompanied by negative values of Δhx and TΔsx; the competition of these values underlies the compatibility or incompatibility of the polymers mentioned.