Introduction of reactive functionality by the incorporation of divinylbiphenyl in ethylene copolymerization with styrene or 1-hexene using aryloxo-modified half-titanocenes and MAO catalysts

摘要

An efficient introduction of vinyl group into poly (ethylene-co-styrene) or poly(ethylene-co-1-hexene) has been achieved by the incorporation of 3,3′-divinylbiphenyl (DVBP) in terpolymerization of ethylene, styrene, or 1-hexene with DVBP using aryloxo-modified half-titanocenes, Cp′TiCl _2(O-2,6-~iPr_2C_6H_3) [Cp′ = Cp~*, ~tBuC_5H_4, 1,2,4-Me _3C_5H_2], in the presence of MAO cocatalyst, affording high-molecular-weight polymers with unimodal distributions. Efficient comonomer incorporations have been achieved by these catalysts, and the content of each comonomer could be varied by its initial concentration charged. The postpolymerization of styrene was initiated from the vinyl group remained in the side chain by treatment with n-BuLi.