Perfluoro 4-cyanobutyl vinyl

Figure 2. Synthesis of perfluoro(4-cyanobutyl vinyl ether)...

Studies with Perfluoro(4-Cyanobutyl Vinyl Ether)... 

Terpolymers of tetrafluoroethylene, perfluoromethyl vinyl ether, and small amounts of a cross-linking termonomer, such as, for example, perfluoro(4-cyanobutyl vinyl ether), are free radically copolymerized in emulsion. Vulcanization occurs by cyclotrimerization of the cyano groups to s-triazine rings. The elastomer has a glass transition temperature of —12 C and a brittle temperature of —39° C. It is very resistant to weathering and possesses a good low-temperature flexibility. 

---