Homo- and Block Copolymerizations of ε-Decalactone with l-Lactide Catalyzed by Lanthanum Compounds

Biobased and environmental-friendly polylactones provide a solution to the increasing crisis of fossil-sourced products. Ring-opening polymerization (ROP) of e-decalactone (DL) catalyzed by lanthanum tris(2,6-di-tert-butyl-4-methylphenolate) [La(OAr)3] and lanthanum tris(borohydride) [La(BH4)3(THF)3] is reported for the first time in this paper. Both of them exhibit good activities producing poly(e-decalactone) (PDL) with molecular weight (MW) up to 26.4 kg/mol and polydispersity index (PDI) as low as 1.10. PLLA-b-PDL-b-PEG-b-PDL-b-PLLA pentablock copolymers with predictable MWs and relatively narrow PDIs (1.19–1.28) are synthesized by sequential ROP of DL and l-lactide (LLA) catalyzed by La(OAr)3 in the presence of poly(ethylene glycol) (PEG). Chain extension reactions of the obtained pentablock copolymers are carried out using l-lysine diisocyanate (LDI) to produce multiblock copolymers with relatively high MW. The thermal behaviors studied by DSC and DMA measurements indicate that PDL is completely amo...

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