Ring opening polymerisations of cyclic esters and carbonate by rare-earth LnCp₃

Titelangaben

Agarwal, Seema ; Puchner, Mario:
Ring opening polymerisations of cyclic esters and carbonate by rare-earth LnCp₃.
In: European Polymer Journal. Bd. 38 (2002) Heft 12 . - S. 2365-2371.
ISSN 1873-1945
DOI: https://doi.org/10.1016/S0014-3057(02)00141-6

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Abstract

The ring opening polymerisation of cyclic esters (ε-caprolactone and l-lactide) and cyclic carbonate (1,3-dioxan-2-one (TMC)) initiated with LnCp3 complexes (Ln=Sm, Er, Pr, Gd and Ce) is reported. The size of the metal atom has an effect on the catalytic activity. The order of reactivity was found to be Er∼Gd>Sm>Pr>Ce. The polyester chains were found to be living for successful synthesis of block copolymers. Polycarbonate (polyTMC) was obtained without {CO2} elimination using LnCp3 as an initiator.