Polymere mit phosphor-stickstoff-bindungen, 6. Zur polymerisation von hexakis(2,2,2-trifluorethoxy)cyclotriphosphazen bei anwesenheit von bortrichlorid

Hexakis(2,2,2-trifluorethoxy)cyclotriphosphazene ( 1b ) reacts with borontrichloride at elevated temperatures to give a mixture of polymeric phosphazenes containing imino dichloro and imino bis(trifluoroethoxy)phosphoranetriyle units. The reaction was investigated by ³¹P NMR. Separation of several fractions of polymers was achieved by hexane/benzene solvent extraction. Molecular weights have been determined by means of membrane and/or vapor pressure osmometry. A reaction mechanism is discussed.