Search

The tensile, thermophysical and tribotechnical characteristics of organoplastics based on thermosetting matrix chaotically reinforced with discrete highly tensile organic fiber have been investigated, and the efficiency of nano-additions introduced both into the polymer matrix and as fibre finish is shown in this paper.

The main laws governing the thermal transformations in vacuum of phenylquinoxalines, which are compounds which simulate the elementary units of polyphenylquinoxalines are studied. These reactions involve a radical-chain mechanism. The initiation stage is determined by the mobility of the hydrogen atoms of the aromatic ring conjugated with the heterocyclic ring. Chain propagation involves radical polymerization at the CN bonds, with the formation of oligomers containing linear and ladder structures consisting of quinoline and benzimidazole fragments. The main volatile product of the thermal degradation of the heterocyclic ring is toluene, formed as the result of transformation of the phenylquinoxaline rings into benzimidazole rings. The pyrolysis is completed on accumulation of insoluble N-containing carbonized residue (60 wt%) and evolution of low molecular degradation products, i.e. 3-phenylbenzimidazole, toluene, benzonitrile, benzene, and hydrogen.

The measurement method of dielectric permeability, which is based on frequency-modulated signal analysis, was examined. The given method allows automating completely the measurement process and determining the effective dielectric permeability with an error factor insignificant enough for designing of microwave systems, as well as for quality control when manufacturing transmission lines