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[(Salen*)Co(OAc)] as robust initiator for the immortal bulk ring-opening (co)polymerization of L-lactide and ε-caprolactone
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DOI：10.1039/D5CY01106J.png)
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Abstract
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The easily accessible and robust [(Salen*)CoIII(OAc)] complex (1) was applied as a unimolecular initiator and moderator for the bulk ring-opening polymerization (ROP) of ε-caprolactone (CL) and biobased L-lactide (LLA); producing the corresponding biodegradable polyesters; polycaprolactone (PCL) and poly(L-lactide) (PLLA); with a relatively good control. The high tolerance of the cobalt(III) complex 1 towards protic additives; such as alcohols; allowed performing the polymerization reactions under immortal conditions; using methanol or benzyl alcohol as transfer agents. Such an approach allows using catalytic amounts of metal (vs. polymer chains) and to fine tune both the polyester chain length (monomer/alcohol ratio) and the nature of the chain end (alcohol). Taking advantage of the living character of the ROP process mediated by complex 1; a well-defined PCL-b-PLLA copolymer could be synthesized in bulk under immortal conditions.
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