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p-Methylselenostyrene (1) and p-phenylselenostyrene (2) as selenium-containing vinyl monomers were prepared. Both monomers are readily polymerized free radically to afford the corresponding polymers having molecular weight of about 20000 -150000.These homopolymers are stable below 300 "C. From the copolymerization with styrene, Q values of 1 and 2 were calculated to be 1,18 and 1,03, respectively. On the other hand, e values of these monomers are 4 , 2 4 and -0,04, respectively, indicating the electron withdrawing character of the seleno groups.

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