Diffusion and flow birefringence of alkylene-aromatic thermotropic polyesters

Hydrodynamic and optical properties of dilute solutions of polydecamethylene-terephthaloyl-di-p-oxybenzoate (P-10-TOB), polypentamethylene-terephthaloyl-di-p-oxybenzoate (P-5-TOB) and polytetramethylene-terephthaloyl-di-p-oxybenzoate (P-4-TOB) in dichloroacetic and trifluoroacetic acids were investigated by translational diffusion, velocity sedimentation, viscometry and flow birefringence. The results of hydrodynamic investigations are interpreted from the standpoint of theories taking account of the draining effect in macromolecules. It is shown, on the basis of hydrodynamic and optical data, that the equilibrium rigidity of molecules (the Kuhn statistical segment) is several times higher for P-10-TOB, P-5-TOB and P-4-TOB than for polyethyleneterephthalate.     

Conformations of certain dialkylarylphosphines and their oxides

Conclusions It is characteristic of the conformations of the dialkylphenylphosphines and their oxides that the bisector of the CPC angle lies in the plane of the benzoyl ring. A. E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Branch of the Academy of Sciences of the USSR. Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 10, pp. 2243–2246, October, 1976.     

New path for the decomposition of bipolar adducts formed by the reaction of olefin oxides with diphenyl-β-hydroxyalkylphosphines

Conclusions A new decomposition path to olefin oxide and phosphine has been found for the R₃P+C-CO-bipolar ion that forms in the olefin oxide-diphenyl--hydroxyalkylphosphine system. It takes place along with the known degradation paths (formation of unsaturated and carbonyl compounds).Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimcheskaya, No. 1, pp. 169–173, January, 1985.