Abstract
AbstractTetrafluoroethylene (TFE) was copolymerized with 1‐fluorosulfonyl‐difluoroacetylfluoride (FSDFAF) in both the bulk and solution by using a free radical initiator at temperature 50°C. The presence of sulfonyl fluoride (SO2F) 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 SO2F 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 1,1,2‐trichloro‐1,2,2‐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 10–15°C lower than polytetrafluoroethylene and their thermal stability was 360–380°C.
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