Indexed by:Journal Article

Date of Publication:2016-02-01

Journal:POLYMER BULLETIN

Included Journals:EI、SCIE

Volume:73

Issue:2

Page Number:509-518

ISSN:0170-0839

Key Words:Random; Styrene-butadiene copolymer; Nd-based catalyst; Polymerization

Abstract:Random styrene (St)-butadiene (Bd) copolymer (SBR) was obtained with the catalyst system composed of Nd(P-507)(3), methylaluminoxane (MAO) and indene. This Nd-based catalyst system showed high activity and selectivity toward the copolymerization. Indene was proven to be the critical component to achieve the high content of St units (similar to 33.0 %). Raising the polymerization temperature was beneficial to enhance the coordination of St to the active center, affording the increased yield and number-average molecular weight (M-n) of SBR. The polymers obtained in aliphatic solvents possessed higher M-n than M-n of SBR generated in toluene. The composition of SBR was controllable by adjusting the feed ratio of St/Bd. NMR and DSC analysis illustrated that the copolymers sustained random distribution even when St incorporation in SBR was up to 33.0 %. SBR was fully characterized by NMR, FTIR, GPC and DSC analysis.