Catalysis in polymerization of cyclic esters. Catalyst and initiator in one molecule. Polymerization of lactide

[Display omitted] •Cationic polymerization of L-lactide was conducted at elevated temperatures (170–190 °C) using CINICAT – a catalyst and initiator in one molecule.•The applied compound became the end-group of the resulting poly(lactides).•The polymerization process was established to be living and...

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Bibliographic Details
Published in:Journal of catalysis 2022-01, Vol.405, p.249-264
Main Authors: Lewinski, Piotr, Kaluzynski, Krzysztof, Pretula, Julia, Mielniczak, Grażyna, Penczek, Stanislaw
Format: Article
Language:English
Subjects:
AMM
Biodegradable
CROP
Lactide
Organocatalysis
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Summary:[Display omitted] •Cationic polymerization of L-lactide was conducted at elevated temperatures (170–190 °C) using CINICAT – a catalyst and initiator in one molecule.•The applied compound became the end-group of the resulting poly(lactides).•The polymerization process was established to be living and controlled.•Poly(lactides) with Mn values up to 4·104 were obtained. Poly(L-lactide) (PLA) was synthetized with initiator and catalyst in one molecule (CINICAT): 5-ethyl-2-hydroxy-5-hydroxymethyl-1,3,2-dioxaphosphorinane-2-oxide (GM). Polymerizations were conducted at the relatively high temperature (170–190 °C) because of the low basicity of LA. Nevertheless, the studied processes were found to be living/controlled, no side reactions were determined and only PLA with fragments of GM as the end-groups were detected. PLA with Mn up to ∼40·103 g/mol. Kinetic studies indicated second order dependence of the rate of polymerization on the initial concentration of the CINICAT. This result is suggesting activation of the monomer and propagation with two independent macromolecules.
ISSN:0021-9517
1090-2694
DOI:10.1016/j.jcat.2021.11.038