Volume 476, Nº 1 (2017)

The deformation properties of epoxy polymers during natural aging in a tepid climate were studied by performing quantitative fractography and investigating the relief of fracture surfaces of epoxy polymers by mechanical tensile testing. The brightness in fracture micrographs correlated with the elongation at fracture.

Modern quantum-chemical and photophysical methods have been used to study the structure of the frontier molecular orbitals and the nature of ligand-to-metal charge transfer (LMCT) transitions of structurally complex d⁰-metallocenes. It has been shown that such metal complexes with carboranyl ligands have emissive LMCT states with preferential charge transfer from aromatic π-ligands to the metal and a large electric dipole moment. The electronic excitation and absorption spectra were simulated for the first time, and dipole moments of metal complexes containing metal–carbon σ- and π-bonds were estimated, which is of fundamental importance for the development of molecular photonics.

A method has been suggested for the production of nanosized silicon carbide powders by adiabatic compression of a monosilane–acetylene gas mixture in argon. The method is distinguished by a nearly monodispersed particle size distribution (the polydispersity index in no higher than 0.1), high purity, and quantitative yield.