Abstract
AbstractWhen p‐isopropylstyrene was polymerized in liquid sulfur dioxide with a free radical initiator, simultaneous radical polysulfone formation and cationic homopolymerization of the olefin occurred. When dimethylformamide was added to the system, cationic polymerization was completely inhibited and only a polysulfone containing p‐isopropylstyrene and sulfur dioxide in the ratio 2:1 was obtained, similar to previously reported reactions with styrene, p‐bromostyrene, and p‐methylstyrene. The overall reaction rate of the radical polymerization was proportional to the initial concentration of the initiator to the order 0.62, indicating that both unimolecular and bimolecular termination was occurring. The radical polymerization of the three‐component mixture, styrene–p–isopropylstyrene–liquid sulfur dioxide, resulted in a copolysulfone which always contained about 33 mole‐% sulfur dioxide and could be considered a copolymer of three different 2:1 olefin : sulfur dioxide units.
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