Effect of Compounding of AlEt 1.5 Cl 1.5 and Al(OPhCH 3 )(i-Bu) 2 on Polymerization Reactivity of Butadiene Catalyzed by Mo-Based Catalyst and Microstructure of Products

Polybutadiene rubbers with high 1, 2-structure contents (HVBR) and partially crystallized trans-1, 4 structures were prepared by the coordination polymerization of butadiene (Bd) catalyzed by two types of catalyst systems of MoCl 5 •tributyl phosphate (TBP)/ Al(OPhCH 3 )(i-Bu) 2 and MoCl 5 •TBP/ AlEt 1.5 Cl 1.5 , respectively. The Al(i-Bu) 2 (OPhCH 3 )/MoCl 5 •TBP catalyst system was firstly added into the reactor to initiate the polymerization of butadiene, and then AlEt 1.5 Cl 1.5 was added alone or AlEt 1.5 Cl 1.5 /MoCl 5 •TBP was joined at the same time to prepare the polymerization blends, of which 1, 2-struceres and trans-1, 4 structures could be adjusted at a certain range. The effects of the adding way of catalyst, adding time of second components and reaction temperature on the polymerization reactivity and microstructures were investigated. The experimental results show that the contents of 1, 2-structure and trans-1, 4-structure could be adjusted from 30% to 80% and from 15% to 60% through control of the adding amounts of two kinds of Al and reaction conditions, which is beneficial to prepare amorphous 1, 2- polybutadiene (1, 2-PB) with a certain crystalline region and is expected to improve the tensile strength of 1, 2-PB. © 2019, Editorial Board of Polymer Materials Science & Engineering. All right reserved.