Synthesis of aliphatic polyesters by controlled ring‐opening polymerization of cyclic esters. Characterization, properties, transesterification reactions
Abstract
The polymerization of (D,L)‐Lactide at room temperature in solution using Y(OCH 2 CH 2 OiPr)3 and Ln 5(μ‐O)(OiPr)13 with Ln = La, Sm, Y, Yb as initiators was studied. According to kinetic data, a controlled type polymerization is observed for most of the systems. La μ‐oxoisopropoxide is the most reactive initiator, but leads to a substantial broadening of molecular weight distribution at high conversions. The nature of transesterification reactions was studied by SEC, 13 C NMR and MALDI‐TOF MS techniques. For Sm and Y‐μ‐oxo initiators only limited intermolecular ester exchange occurs, while with La μ‐oxoinitiator and with Y(OCH 2 CH 2 OiPr)3 initiator, but after a long time of the polymerization reaction, both inter and intramolecular transesterification occur with formation of cyclics.
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The lanthane initiator is the most reactive with a half-reaction time of 45 s, and the reactivity range is La>Y>>Yb.
“The lanthane initiator is the most reactive with half-reaction time of 45 s, the reactivity range being La>Y>>Yb.”
From Recent advances in the synthesis of aliphatic polyesters by ring-opening polymerization☆ (2008) · cites this paper as [17]
Depending on the nature of the metal, the number of active sites is close to 2.6 or 2.0.
“Depending on the nature of the metal, the number of active sites is close to 2.6 or 2.0.”
From Recent advances in the synthesis of aliphatic polyesters by ring-opening polymerization☆ (2008) · cites this paper as [17]
With Sm, Y and Yb a narrow polydispersity is observed until high conversions, while for La initiator the polydispersity increases with conversion, indicating that transesterification reactions occur.
“With Sm, Yand Yb a narrow polydispersity is observed until high conversions while for La initiator the polydispersity increases with conversion indicating that transesterification reactions occur.”
From Recent advances in the synthesis of aliphatic polyesters by ring-opening polymerization☆ (2008) · cites this paper as [17]
ROP of (D,L)-lactide using rare earth (μ-oxo)isopropoxides as initiator systems proceeds rapidly at room temperature.
“The ROP of (D,L)-lactide using rare earth (µ-oxo)isopropoxides as initiator systems proceeds rapidly at room temperature [17].”
From Recent advances in the synthesis of aliphatic polyesters by ring-opening polymerization☆ (2008) · cites this paper as [17]
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References 27 · Cited by 14
- Authors
- Spassky, N., Simic, V., Hubert‐Pfalzgraf, L. G., & Montaudo, M. S.
- Affiliations
- Université Pierre-et-Marie-Curie (FR)
- Corresponding author
- Spassky, Nicolas
- Venue
- Macromolecular Symposia
- Publisher
- Wiley
- Published
- 1999-10
- Volume
- 144
- Issue
- 1
- Pages
- 257-267
- ISSN
- 1022-1360 (ISSN-L)
- 1521-3900
- OpenAlex
- W2169330827
- Cited by
- 14
- References
- 27
- Citations by year
- 2022: 2 · 2015: 2 · 2014: 1 · 2013: 1
- FWCI
- 0.95
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Macromolecular Symposia (publishedVersion)
- HAL (submittedVersion)
- Topics
- Physical Sciences › Materials Science › Biomaterials › biodegradable polymer synthesis and properties
- Physical Sciences › Chemistry › Organic Chemistry › Advanced Polymer Synthesis and Characterization
- Physical Sciences › Chemical Engineering › Process Chemistry and Technology › Carbon dioxide utilization in catalysis
- Keywords
- aliphatic polyesters, ring-opening polymerization, cyclic esters, lactide, controlled polymerization, polymerization kinetics, molecular weight distribution, transesterification
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