This is because the PFA composition contains 1wt%-10wt% perfluoropropyl vinyl ether (PPVE), which significantly improves the flexibility of the PFA polymer chain, reduces the crystallinity of PFA, and makes PFA have good thermoplasticity. After the PFA resin is synthesized, a post-treatment process for unstable end groups is required to convert the unstable end groups into stable end groups to prepare high-purity PFA. The global consumption in 2002 was about 5 kt/a, 80% of which were used in the semiconductor manufacturing industry.Fusible polytetrafluoroethylene (PFA) is a very important new type of fluorine-containing resin. After most of the solvent was evaporated at room temperature, it was heated to 150° C. Currently, there are four major manufacturers in the world: Du Pont, Daikin, Asahi Glass, and Dyneon.5 ml/min. and air was used to drive out the remaining solvent to obtain 14.3 g of resin.44 wt%. PFA polymerization process: In a 1 L stainless steel autoclave, after vacuuming to remove O2, start stirring. The melt viscosity of 109 poise is reduced to about 104-106 poise, which overcomes the shortcomings of difficult processing of PTFE. After analysis, the melt viscosity of PFA is 2. Its chemical stability, physical and mechanical properties, electrical PTFE BBQ Grill Mats insulation properties, lubricity, non-stick, aging resistance, non-combustibility and thermal stability The properties are very good, similar to PTFE, the high temperature mechanical strength is about 2 times higher than that of PTFE; and it can be processed by extrusion, blow molding, injection molding and other general thermoplastic molding processes.38g of ethane chain transfer agent, and 20ml of PPVE, the temperature is raised to 60℃, the stirring speed is 1000 r/min, TFE is passed until 0. After adding 800ml of perfluoro-N-methylmorpholine (PFNMM), 0. Unstable end groups can be converted into two types of stable end groups: -CONH2, -CF3, correspondingly, there are two treatment methods for unstable end groups: (1) NH3 and ammonium salt treatment PFA; (2) fluorine gas Deal with PFA.5 and 0.5 MPa, and then 1O is injected with a pump ml of FC-ll3 solution of bisperfluoropropionyl peroxide to start the polymerization reaction.55×10 poise, and the content of PPVE is 4.6 MPa; continuously inject the initiator solution at a rate of 0. After the polymerization, the polymer slurry was cooled, vented, and discharged. During the polymerization, continuously add TFE to keep the kettle pressure between 0