Syntheses of aliphatic polyesters catalyzed by lanthanide triflates
- Polycondensations of 1,6-hexane diol and sebacic acid were conducted in bulk with addition of a lanthanide triflate as acidic catalyst. With exception of promethium triflate all lanthanide triflates were studied. A particularly low molecular weight was obtained with neodym triflate and the best results with samarium triflate. With Sm(OTf)3 weight average (Mw) values up to 65 kDa (uncorrected SEC data) were achieved after optimization of the reaction conditions. Comparison of these results with those obtained from bismuth, magnesium, and zinc triflates, on the one hand, and comparison with the acidities of all catalysts, on the other, indicates that the esterification mechanism involves complexation of monomer by metal ions. Preparation of multiblock copoly(ether ester)s failed due to insufficient incorporation of poly(tetrahydrofuran) diols.
Autor*innen: | M. Garaleh, M. Lahcini, H.R. Kricheldorf, Steffen WeidnerORCiD |
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Dokumenttyp: | Zeitschriftenartikel |
Veröffentlichungsform: | Verlagsliteratur |
Sprache: | Englisch |
Titel des übergeordneten Werkes (Englisch): | Journal of polymer science A, polymer chemistry |
Jahr der Erstveröffentlichung: | 2009 |
Verlag: | Wiley |
Verlagsort: | Hoboken, NJ |
Jahrgang/Band: | 47 |
Ausgabe/Heft: | 1 |
Erste Seite: | 170 |
Letzte Seite: | 177 |
Freie Schlagwörter: | Biodegradable polyesters; Lanthanide ions; MALDI-TOF; Macrocycles; Polycondensation |
DOI: | 10.1002/pola.23136 |
ISSN: | 0360-6376 |
ISSN: | 0887-624X |
Verfügbarkeit des Dokuments: | Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access") |
Bibliotheksstandort: | Sonderstandort: Publica-Schrank |
Datum der Freischaltung: | 19.02.2016 |
Referierte Publikation: | Ja |
Datum der Eintragung als referierte Publikation: | 09.07.2009 |