Novel [Sm2I(NPPh3)5(DME)] Initiator for the Living Ring-Opening Polymerization of ε-Caprolactone and δ-Valerolactone
Abstract
Ring-opening polymerization of ε-caprolactone (CL) and δ-valerolactone (VL) was carried out using the initiator system [Sm 2 I(NPPh 3 ) 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 °C 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.
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At 0 °C with the bimetallic Sm initiator, the molecular weight distribution is narrow (PDI ~ 1.2), indicating fast initiation compared with propagation and transesterification reactions.
“At 0 °C, the molecular weight distribution is narrow (PDI ~ 1.2), which indicates a fast initiation compared with propagation and transesterification reactions if any.”
From Recent advances in the synthesis of aliphatic polyesters by ring-opening polymerization☆ (2008) · cites this paper as [16]
Bimetallic [Sm2I(NP(C6H5)3)5(DME)] is an effective initiator for ROP of ε-CL and δ-VL in toluene.
“Greiner and co-workers have shown that bimetallic [Sm 2 I(NP(C 6 H 5 ) 3 ) 5 (DME)] is an effective initiator for ROP of ε-CL and δ-VL in toluene [ 16].”
From Recent advances in the synthesis of aliphatic polyesters by ring-opening polymerization☆ (2008) · cites this paper as [16]
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- Authors
- Ravi, P., Gröb, T., Dehnicke, K., & Greiner, A.
- Affiliations
- Philipps University of Marburg (DE)
- ORCID
- Greiner, Andreas
- Venue
- Macromolecules
- Publisher
- American Chemical Society (ACS)
- Published
- 2001-11-08
- Volume
- 34
- Issue
- 25
- Pages
- 8649-8653
- ISSN
- 0024-9297 (ISSN-L)
- 1520-5835
- OpenAlex
- W2005491872
- Cited by
- 32
- References
- 19
- Citations by year
- 2025: 1 · 2021: 1 · 2020: 1 · 2019: 1 · 2015: 1 · 2013: 3 · 2012: 4
- FWCI
- 2.30
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Macromolecules (publishedVersion)
- Topics
- Physical Sciences › Materials Science › Biomaterials › biodegradable polymer synthesis and properties
- Physical Sciences › Chemistry › Organic Chemistry › Advanced Polymer Synthesis and Characterization
- Physical Sciences › Chemistry › Organic Chemistry › Organometallic Complex Synthesis and Catalysis
- Keywords
- living ring-opening polymerization, ε-caprolactone, δ-valerolactone, living polymerization, polydispersity, copolymerization, block copolymers, toluene
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