Coordination polymerization styrene-ethylene copolymers

New block copolymers of polystyrene and poly(e-caprolactone) have recently been prepared with a combination of coordination catalyst and anionic polymerization( An amorphous styrene block was prepared by conventional anionic polymerization at room temperature, and terminated with ethylene oxide. After hydrolysis the terminal - OH groups were substituted by oxo-Al-Zn alkoxide. A crystalline block was then added by coordination polymerization of e-caprolactam. 

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