"Synthesis of ultra-high cis-1,4-polybutadiene rubber catalysized by using novel neodymium-based catalyst system"

Abstract

The polymerization behavior of butadiene was studied using a catalytic system composed of modified neodymium neodecanoate [m-Nd(vers)3] as the main catalyst, triisobutyl aluminum as co-catalysts and chlorine sources. The effects of amount of co-catalyst triisobutyl aluminum, chlorine source structure, polymerization temperature and amount of catalyst on the polymerization activity of butadiene, structure selectivity of cis-1,4-unit, molecular weight and its distribution of the polymer were investigated. The results showed that polybutadiene catalysized by m-Nd(vers)3/triisobutyl aluminum/sesquiethyl aluminum chloride system could be obtained with higher catalytic activity, ultra-high content of cis-1,4-unit structure (mole fraction up to 99.2%), high number-average molecular weight (1.19×105 to 4.12×105) and narrow molecular weight distribution (polydispersity index less than 2.5).

Keywords

• modified rare earth neodymium catalyst，butadiene， cis-1
• 4-unit， polymerization activity， triisobutyl aluminium， sesquiethyl aluminum chloride，number-average relative molecular weight，