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- W4251551323 abstract "The kinetics of isoprene polymerization with n-butyllithium in n-heptane solution has been constructed on the basis of the elementary reactions characterized in the preceding paper.The concentration of Li attached to the polymer end [Pt] is directly proportional to avariable τ(τ=∫[M] dt) giving an equation._??_where P0 is first step product of initiation involving n-butyllithium and monomer. The concentration of consumed monomer ([M] 0-[M]) is directly proportional to the τ2 as expressed in the following equation, _??_where [C1] 0 is initial concentration of non-associated n-butyllithium and K4 is equilibrium. constant of a cross-associatiation between n-butyllithium and polymer-end-Li. The concentration of the first step product of initiation [P] increases as the initial n-butyllithium concentration increases and [P0]/(1+K4 [C1] 02) decreases as the initial n-butyllithium concentration increases.Thus, these results explain satisfactorily the experimental results including the polymerization rate retardation as well as the sigmoidal conversion curve caused by excess of n-butyllithium. The calculated molecular weight distribution based on these kinetic equations agree well with those determined by the column fractionation method." @default.
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- W4251551323 date "1968-01-01" @default.
- W4251551323 modified "2023-10-14" @default.
- W4251551323 title "Control of the Molecular Weight Distribution in Anionic Polymerization of Isoprene" @default.
- W4251551323 doi "https://doi.org/10.1295/koron1944.25.355" @default.
- W4251551323 hasPublicationYear "1968" @default.
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