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Sulfur-containing ABA-type polycarbonate triblock copolymers were synthesized  via  sequential copolymerization of propylene oxide (PO) and carbon dioxide (CO 2 ), followed by propylene oxide (PO) and phthalic thioanhydride (PTA) in the presence of water and Salen-Metal catalysts. The reaction was catalyzed using Salen-Co(III)-Cl/[PPN]Cl and Salen-Cr(III)-Cl/[PPN]Cl catalyst systems. The content of thioester units in the copolymer chain could be adjusted by varying the feed ratios of PTA. These triblock polymers displayed a higher refractive index, reaching up to 1.561.

journal of macromolecular science, part a

Synthesis of sulfur-containing polycarbonate block copolymers  via  Salen-metal catalyzed copolymerization of CO 2 , propylene oxide, and phthalic thioanhydride