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Reactivity of Sm(II) compounds as ring-opening polymerization initiators for lactones

Title data

Agarwal, Seema ; Brandukova-Szmikowski, Natalia E. ; Greiner, Andreas:
Reactivity of Sm(II) compounds as ring-opening polymerization initiators for lactones.
In: Macromolecular Rapid Communications. Vol. 20 (21 April 1999) Issue 5 . - pp. 274-278.
ISSN 1521-3927
DOI: https://doi.org/10.1002/(SICI)1521-3927(19990501)20:5<274::AID-MARC274>3.0.CO;2-J

Official URL: Volltext

Abstract in another language

Successful room temperature ring-opening polymerization (ROP) of ε-caprolactone and δ-valerolactone has been carried out using SmX2 (X = I, Br, and cyclopentadienyl (Cp)) catalysts. SmI2 in the presence of metallic Sm was found to have enhanced reactivity as room temperature ROP initiator for lactones as compared to pure SmI2. SmBr2 and SmCp2 showed increased reactivity compared with the Sm/SmI2 system due to their higher reductive power. The catalyst concentration and time of polymerization showed a marked effect on number-average molecular weight (Mn). There was a decrease in Mn on increasing reaction time and decreasing catalyst concentration. The initiation mechanism is discussed based on end group analysis of low molecular weight polymers.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: EPSILON-CAPROLACTONE POLYMERIZATION; COMPLEXES; MECHANISM
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II
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
Result of work at the UBT: No
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 29 May 2015 09:39
Last Modified: 29 May 2015 09:39
URI: https://eref.uni-bayreuth.de/id/eprint/14471