Novel [Sm₂I(NPPh₃)₅(DME)] Initiator for the Living Ring-Opening Polymerization of ε-Caprolactone and δ-Valerolactone

Title data

Ravi, Palaniswamy ; Gröb, Thorsten ; Dehnicke, Kurt ; Greiner, Andreas:
Novel [Sm₂I(NPPh₃)₅(DME)] Initiator for the Living Ring-Opening Polymerization of ε-Caprolactone and δ-Valerolactone.
In: Macromolecules. Vol. 34 (2001) Issue 25 . - pp. 8649-8653.
ISSN 1520-5835
DOI: https://doi.org/10.1021/ma010496k

Official URL:

Abstract in another language

Ring-opening polymerization of epsilon -caprolactone (CL) and delta -valerolactone (VL) was carried out using the initiator system Sm2I(NPPh3)(5)(DME)] in the presence of toluene. Experimental molecular weights were in good agreement with the theoretical molecular weights for CL](0)/1](0) up to 350. Polydispersities are low at 0-20 degreesC but increase at higher temperatures. Addition of small amounts of coordinating solvents such as THF and DME decreased the rate of polymerization and thereby reduced the polydispersity. The active polymer chain ends have been shown by sequential copolymerization of CL and VL, resulting in block copolymers.

Further data

Item Type:	Article in a journal
Refereed:	Yes
Keywords:	SAMARIUM COMPLEXES; LACTONES; KINETICS; LACTIDE; SYSTEM
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 11:22
Last Modified:	28 Jul 2023 09:21
URI:	https://eref.uni-bayreuth.de/id/eprint/9830