Titelangaben
Ravi, Palaniswamy ; Gröb, Thorsten ; Dehnicke, Kurt ; Greiner, Andreas:
Ring-Opening Polymerization of ε-Caprolactone by Phosphorane Iminato and Cyclopentadienyl Complexes of Rare Earth Elements.
In: Macromolecular Chemistry and Physics.
Bd. 202
(2001)
Heft 12
.
- S. 2641-2647.
ISSN 1521-3935
DOI: https://doi.org/10.1002/1521-3935(20010801)202:12<2641::AID-MACP2641>3.0.CO;2-Q
Abstract
Rare earth element complexes with triphenyl phosphorane iminato ligands such as [La2(NPPh3)4(μ-NPPh3)2(μ-THF)] and [Yb(NPPh3)3]2 initiate the polymerization of ε-caprolactone to give high molecular weight poly(ε-caprolactone) with moderate polydispersity. The reactivity of these complexes is higher as compared to complexes with three cyclopentadienyl ligands with corresponding metal centers. The initiation mechanism for the polymerization of ε-caprolactone by [La2(NPPh3)4(μ-NPPh3)2(μ-THF)] is discussed based on the end groups of low molecular weight polycaprolactones. Living chain ends of poly(ε-caprolactone) were proved by block copolymerization of ε-caprolactone and δ-valerolactone. The mixed complex [Cp3Dy2(NPPh3)3] has been successfully applied for ROP of CL. A significant increase in molecular weight of ROP has been observed with decrease of reaction temperature.
Weitere Angaben
Publikationsform: | Artikel in einer Zeitschrift |
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Begutachteter Beitrag: | Ja |
Keywords: | INITIATED LIVING POLYMERIZATIONS; DELTA-VALEROLACTONE; NONPOLAR MONOMERS; COORDINATION; LACTONES; POLAR |
Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Makromolekulare Chemie II > Lehrstuhl Makromolekulare Chemie II - Univ.-Prof. Dr. Andreas Greiner Fakultäten Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Makromolekulare Chemie II |
Titel an der UBT entstanden: | Nein |
Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 540 Chemie |
Eingestellt am: | 07 Apr 2015 13:20 |
Letzte Änderung: | 21 Dec 2023 10:06 |
URI: | https://eref.uni-bayreuth.de/id/eprint/9840 |