Premium
Styrene–butadiene block copolymer with high cis ‐1,4 microstructure
Author(s) -
Zhu Han,
Wu YiXian,
Zhao JiangWei,
Guo QingLei,
Huang Qigu,
Wu GuanYing
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.26528
Subject(s) - copolymer , polybutadiene , styrene , polystyrene , materials science , styrene butadiene , polymer chemistry , microstructure , fourier transform infrared spectroscopy , elastomer , chemical engineering , polymer , composite material , engineering
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