Supercritical behavior in free radical polymerization of ethylene in the medium pressure range
Literature Information
Etienne Grau, Jean-Pierre Broyer, Christophe Boisson, Roger Spitz, Vincent Monteil
Free radical polymerization of ethylene in an intermediate pressure and temperature range (Pethylene < 250 bar and 50 °C < T < 90 °C) in the presence of an organic solvent has been studied. Under selected conditions (P, T) and according to the amount of organic solvent added, either a supercritical monophasic or a biphasic medium is obtained. In the case of a biphasic medium, polymerization occurred in the liquid phase in which radical initiator and ethylenes are dissolved. The transition between a monophasic to a biphasic medium has been predicted using thermodynamic calculations and has been related to experimental observations such as the dependence of polymerization activity versus solvent volume.
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