Synthesis of butadiene/isoprene-styrene di-block copolymer with high cis-1,4 unit content based on a neodymium phosphate ester.

ABSTRACT: A novel two-step synthesis strategy based on a liquid neodymium phosphate ester (Nd(P₅₀₇)₃) catalyst was used to synthesize diene-styrene di-block copolymers with high cis-1,4 unit content, such as butadiene-styrene (PB-b-PS), isoprene-styrene (PI-b-PS), and so on. The strategy not only makes full use of the high cis-1,4 stereo-selectivity of the rare earth catalyst to conjugated dienes, but also adjusts the electron cloud density of the catalytic active center by introducing triphenyl phosphine (PPh₃). Thus, the catalytic activity of the neodymium-based catalyst center toward styrene has been largely improved, and a series of PB/PI-b-PSs with high cis-1,4 unit content (98.3 and 98.1% respectively), narrow molecular

SUBMITTER: Liu J 

PROVIDER: S-EPMC9043828 | biostudies-literature | 2021 Nov

REPOSITORIES: biostudies-literature