Anionic Copolymerization of Styrene and trans-Stilbene with n-Butyllithium

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Abstract
The anionic copolymerization of styrene (M1) and trans-stilbene (M2) by n-butyllithium was investigated, trans-stilbene, which can not homopolymerized by itself, could be copolymerized with styrene in tetrahydrofuran and in benzene by an anionic catalyst. The copolymerization in tetrahydrofuran proceeded with a chain transfer to trans-stilbene, while that in benzene seemed to proceed without the chain transfer. The monomer reactivity ratio, r1 was obtained from the copolymer composition at the complete consumption of M1 assuming that the rate constant, k22, is zero. The r1 values were 2.3 in tetrahydrofuran at 0°C and 18 in benzene at 30°C. The color of the solution changed from red to purple in tetrahydrofuran, while in benzene no change occurred.

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