PFA (Perfluoroalkoxy Polymer)

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PFA is a copolymer of TFE and a perfluoroalkyl vinyl ether such as perfluoropropyl vinyl ether PPVE. Copolymerization of perfluoroalkylvinyl ethers with tetrafluoroethylene can be done in a halogenated solvent, in an aqueous phase sometimes containing some halogenated solvent, usually in the absence of a surfactant. Terpolymers of this class contain other monomers such as hexafluoropropylene HFP. Commercially, PFA is polymerized by free-radical polymerization mechanism usually in an aqueous media via addition polymerization of TFE and perfluoropropyl vinyl ether. The initiator for the polymerization is usually water-soluble peroxide such as ammonium persulfate. Chain transfer agents such methanol, acetone and others are used to control the molecular weight of the resin. Generally, the polymerization regime resembles that used to product PTFE by emulsion polymerization. Polymerization temperature and pressure usually range from 15 to 95℃ and 0.5 to 3.5 MPa.

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ZHEJIANG FOTECT INTERNATIONAL CO. LTD

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