Styrene–butadiene block copolymer with high cis‐1,4 microstructure

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Abstract

Abstract The sequential block copolymerization of styrene (St) and butadiene (Bd) was carried out with an activated rare earth catalyst composed of catalyst neodymium tricarboxylate (Nd), cocatalyst Al(i‐Bu) 3 (Al), and chlorinating agent (Cl). The microstructure, composition, and morphology of the copolymer were characterized by FTIR, 1 H NMR, 13 C NMR, and TEM. The results show that styrene–butadiene diblock copolymer with high cis ‐1,4 microstructure of butadiene units (∼ 97 mol %) was synthesized. The cis ‐selectivity for Bd units was almost independent on the content of styrene units in the copolymer ranging from 18.1 mol % to 29.8 mol %. The phase‐separated morphology of polystyrene (PS) domains of about 40 nm tethered by the elastomeric polybutadiene (PB) segments is observed. The PS‐ b ‐ cis ‐PB copolymer could be used as an effective compatilizer for noncompatilized binary PS/ cis ‐PB blends. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007

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