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Ring-opening polymerization of ε-caprolactone and δ-valerolactone using new Sm(III) μ-halo-bis(trimethylsilyl)amido complexes

Title data

Agarwal, Seema ; Karl, Marc ; Dehnicke, Kurt ; Seybert, Gert ; Massa, Werner ; Greiner, Andreas:
Ring-opening polymerization of ε-caprolactone and δ-valerolactone using new Sm(III) μ-halo-bis(trimethylsilyl)amido complexes.
In: Journal of Applied Polymer Science. Vol. 73 (August 1999) Issue 9 . - pp. 1669-1674.
ISSN 1097-4628
DOI: https://doi.org/10.1002/(SICI)1097-4628(19990829)73:9<1669::AID-APP7>3.0.CO;2-1

Official URL: Volltext

Abstract in another language

New Sm(III) mu-halo-bis(trimethylsilyl)amido complexes Sm(mu-X) {N(SiMe3)(2)}(2)(THF)](2) (X = Cl, Br) were synthesized and their crystal structures were analyzed. These complexes were used as catalysts for the homopolymerization of epsilon-caprolactone and delta-valerolactone and found to initiate ring-opening polymerization (ROP) of these monomers in high conversion over a short period, giving homopolymers with a moderate polydispersity index (similar to 2.0). The effect of temperature and the catalyst amount on the molecular weight distribution was also studied. Mechanistic studies were conducted using 1 : 1 and 1 : 6 molar ratios of mu-halo-bis-(trimethylsilyl)amido complexes and epsilon-caprolactone by H-1-NMR and C-13-NMR spectroscopic techniques and revealed the presence of more than one initiating species. (C) 1999 John Wiley & Sons, Inc.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: samarium; catalysis; ring-opening polymerization; lactones
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II > Chair Macromolecular Chemistry II - Univ.-Prof. Dr. Andreas Greiner
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II
Result of work at the UBT: No
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 07 Apr 2015 12:16
Last Modified: 07 Apr 2015 12:16
URI: https://eref.uni-bayreuth.de/id/eprint/9870