Method for preparing ethylene-tetrafluoroethylene copolymer in supercritical carbon dioxide

The invention discloses a method for preparing an ethylene-tetrafluoroethylene copolymer in supercritical carbon dioxide, which comprises the following steps: under the action of an initiator and a chain transfer agent, polymerizing ethylene, tetrafluoroethylene and a fluorine-containing third monom...

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Bibliographische Detailangaben
Hauptverfasser:	WANG PING, WANG LI, ZHU LICHENG, SI GAOFEI, XIA LICHAO, ZHAO SHUHUI, ZHANG HENG
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:	The invention discloses a method for preparing an ethylene-tetrafluoroethylene copolymer in supercritical carbon dioxide, which comprises the following steps: under the action of an initiator and a chain transfer agent, polymerizing ethylene, tetrafluoroethylene and a fluorine-containing third monomer in a supercritical carbon dioxide medium to obtain the ethylene-tetrafluoroethylene copolymer, and the chain transfer agent is polyfluorosiloxane. Polyfluorosiloxane is selected as a chain transfer agent for preparing the ethylene-tetrafluoroethylene copolymer in supercritical carbon dioxide, the polyfluorosiloxane contains fluorine and has a certain affinity effect with the ethylene-tetrafluoroethylene copolymer, and a siloxane chain segment of the polyfluorosiloxane is compatible with supercritical carbon dioxide, so that the chain segment of the polyfluorosiloxane has a certain affinity effect with the ethylene-tetrafluoroethylene copolymer. The function of a stabilizer is realized, so that the polymer is sta