Titlebar

Export bibliographic data
Literature by the same author
plus on the publication server
plus at Google Scholar

 

Ring-Opening Polymerization of ε-Caprolactone by Phosphorane Iminato and Cyclopentadienyl Complexes of Rare Earth Elements

Title data

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. Vol. 202 (August 2001) Issue 12 . - pp. 2641-2647.
ISSN 1521-3935
DOI: https://doi.org/10.1002/1521-3935(20010801)202:12<2641::AID-MACP2641>3.0.CO;2-Q

Official URL: Volltext

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: INITIATED LIVING POLYMERIZATIONS; DELTA-VALEROLACTONE; NONPOLAR MONOMERS; COORDINATION; LACTONES; POLAR
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 13:20
Last Modified: 07 Apr 2015 13:20
URI: https://eref.uni-bayreuth.de/id/eprint/9840