Anionic Polymerization Characteristics of the 1:1 Complex of n-Butylsodium and n-,s-Dibutylmagnesium (Sodium Tributylmagnesiate)

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Abstract
The behavior of isoprene and styrene polymerizations initiated by the complex of n-butylsodium and n-,s-dibutylmagnesium (sodium tributylmagnesiate) has been examined. The styrene-benzene system was found to yield stable active centers and polymers of predictable molecular weight and narrow molecular weight distributions. Isoprene, however, did not follow this behavior and yielded polydisperse material having molecular weights lower than those predicted on the basis that only n-butylsodium is capable of initiating chain growth. The polyisprene microstructure was found to consist of ∼60% 3,4 and ∼40% 1,4 units.