Synthesis of a copolymer of tetrafluoroethylene and 1-fluorosulfonyl–difluoroacetylfluoride

✍ Scribed by G. K. Kostov; G. D. Ivanov; St. V. Kotov

• Publisher: John Wiley and Sons
• Year: 1991
• Tongue: English
• Weight: 416 KB
• Volume: 42
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1991.070421014

✦ Synopsis

Tetrafluoroethylene ( TFE ) was copolymerized with 1-fluorosulfonyl-difluoroacetylfluoride (FSDFAF) in both the bulk and solution by using a free radical initiator at temperature 50OC. The presence of sulfonyl fluoride ( -S02F) functional groups in the copolymers was proved by infrared (IR) spectroscopy. The copolymers were subjected to alkaline hydrolysis followed by an acid treatment and the -S02F groups content was found not to exceed 0.40-0.50 meq/ g with polymer yield ranging between 1 and 36%. Copolymerization in solution of l,l,Z-trichloro-l,Z,Z-trifluoroethane (Freon 113) under TFE pressure about 1.0 MPa and TFE/FSDFAF mole ratio 1.5-2.0 was proposed for further investigations. A random distribution of single FSDFAF units along the polymeric chain consisting mainly of TFE fragments was considered to exist. The copolymers had melting temperatures within 10-15OC lower than polytetrafluoroethylene and their thermal stability was 360-380°C.