Polymerization and copolymerization studies on vinyl fluoride

摘要: The polymerization of vinyl fluoride has been studied in the temperature range 0–50°C. with aid different types initiators. Ziegler-Natta systems based on vanadyl acetylacetonate and AIR(OR)Cl compounds showed good activity. Enhanced reaction rates higher degrees were achieved boron alkyls (and, to a lesser degree, Cd, Zn, Be alkyls) activated by oxygen. With either initiator, main features kinetic parameters determined. In all cases, is considered be free-radical type, though some properties (crystallinity, melting temperature) polymer are shown markedly improved over previously described high-pressure polymer. This chiefly ascribed an degree chemical regularity chains. copolymerization presence cited initiators was number monomers. values allow us obtain Q (0.010 ± 0.005) e (−0.8±0.2) discuss reactivity radical chain propagation.