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Erschienen in: Polymer Bulletin 11/2018

27.03.2018 | Original Paper

Kinetics, mechanisms and polymer property studies of ring-opening polymerization of ɛ-caprolactone and lactides initiated by (benzimidazolylmethyl)amino Zn(II) alkoxides

verfasst von: Ekemini D. Akpan, Bernard Omondi, Stephen O. Ojwach

Erschienen in: Polymer Bulletin | Ausgabe 11/2018

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Abstract

The reactions of substituted (benzimidazolylmethyl)amines ligands (L1–L3) with ZnEt2 in the presence of either BnOH or t-BuOH afforded the corresponding Zn(II) metal alkoxides [Zn(L1)(OBn)]2 (1), [(Zn(L2)(OBn)]2 (2), [Zn(L3)(OBn)]2 (3), [Zn(L2)(t-BuO)]2 (4), respectively. Complexes 14 formed effective initiators in the ring-opening polymerization (ROP) reactions of ɛ-caprolactone (ɛ-CL), D,L-lactide (D,L-LA) and L-lactide (L-LA). The ROP reactions followed pseudo-first-order kinetics with respect to monomer. Moderate molecular weight polymers of 10,650 g mol−1 exhibiting relatively narrow molecular weight distributions (1.16–1.54) were obtained. Predominantly crystalline isotactic poly(L-LA) and heterotactic poly(D,L-LA) were produced, respectively. Thermal analyses of PLA also supported the formation of isotactic poly(L-LA) with decomposition temperature of 298 °C.

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Metadaten
Titel
Kinetics, mechanisms and polymer property studies of ring-opening polymerization of ɛ-caprolactone and lactides initiated by (benzimidazolylmethyl)amino Zn(II) alkoxides
verfasst von
Ekemini D. Akpan
Bernard Omondi
Stephen O. Ojwach
Publikationsdatum
27.03.2018
Verlag
Springer Berlin Heidelberg
Erschienen in
Polymer Bulletin / Ausgabe 11/2018
Print ISSN: 0170-0839
Elektronische ISSN: 1436-2449
DOI
https://doi.org/10.1007/s00289-018-2321-2

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