Polymer, Vol.54, No.12, 2973-2978, 2013
Synthesis of syndiotactic cis-1,4-polypentadiene by using ternary neodymium-based catalyst
Stereoselective polymerization of 1,3-pentadiene (1,3-PD) by using the ternary catalyst system neodymium versatate (Nd(vers)(3))/alkylaluminium/Al(i-Bu)(2)Cl was examined. Both homogeneous and heterogeneous catalyst systems prepared in the presence or absence of 1,3-PD monomer during catalyst preparation were employed for 1,3-PD polymerization. The effects of the type of alkylaluminium, [Al]/[Nd] molar ratio, and polymerization temperature on polymerization behaviours were investigated in detail. Syndiotactic polypentadienes with cis-1,4 content ranged from 48.4% to 832% depending on polymerization conditions were obtained. The compounded polypentadiene vulcanizate showed fairly good mechanical properties, demonstrating 1,3-PD and the resultant polypentadiene are both qualified as a conjugated diene monomer and a synthetic rubber for practical application, respectively. (c) 2013 Elsevier Ltd. All rights reserved.