Route of precursor

This process can offer wide selection of the synthetic routes of precursor hydrocarbon, shorter steps, and low-cost production of the perfluorinated polymers [27]. 

Different from PTFE and ETFE, cost reduction of the PS VE polymer is one of the problems for prevailing perfluorinated membranes. Recently, a new direct fluorina-tion process with elementary fluorine was reported to produce perfluorinated fluo-rosulfonyl polymers, as shown in Fig. 2.4 [47], This new process eonsists of the following features and is free from explosion in the gas phase and the difficulty in finding solvents with stability to fluorine gas and solubUity for hydrocarbon com-poimds, these problems having limited the application of the eonventional direct fluorination methods (1) decomposition of the ester and regeneration of RFCOF into an ester (RFCOOR) that is not very volatile and soluble in RFCOF (2) direct fluorination with elementary fluorine gas and (3) deeomposition of the ester and regeneration of RFCOF. This proeess ean offer wide seleetion of the synthetie routes of precursor hydrocarbon, shorter steps, and low-cost produetion of the perfluorinated polymers [52]. 

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