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Polylactones, 22 ABA triblock copolymers of L‐lactide and poly(ethylene glycol)
Abstract
Triblock copolymers were prepared from L‐lactide and a poly(ethylene glycol) of M̄n = 1020. With GeO 2 and SnO 2 only low conversions were obtained, regardless of the reaction temperature. Sb 2 O 3 caused partial racemization, and only SnO gave satisfactory results. When other samples of poly(ethylene glycol) were used (e.g., with M̄n = 600 or 3250), partial racemization occurred even with SnO. However, with Sn(II) 2‐ethylhexanoate, racemization‐free triblock copolymers were obtained under the reaction conditions used. The results of the characterization indicate that the triblock copolymers possess unimodal molecular weight distribution. The lactide blocks crystallize in the α‐modification and suppress in most, but not all, cases the crystallization of the poly(ethylene glycol) blocks. The crystallization of long poly(ethylene glycol) blocks observed in several cases indicates a triphasic character of these samples.
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Citations
Cited by
Recent Developments in Ring Opening Polymerization of Lactones for Biomedical Applications
Albertsson, A.-C., & Varma, I. K. (2003) · Biomacromolecules · doi:10.1021/bm034247a · Cited by 1,582
New emerging trends in synthetic biodegradable polymers—Polylactide: A critique
Gupta, A. P., & Kumar, V. (2007) · European Polymer Journal · doi:10.1016/j.eurpolymj.2007.06.045 · Cited by 941
Biodegradable Polymers-A Review on Recent Trends and Emerging Perspectives
Luckachan, G. E., & Pillai, C. K. S. (2011) · Journal of Polymers and the Environment · doi:10.1007/s10924-011-0317-1 · Cited by 767
Polylactones 48. SnOct2-Initiated Polymerizations of Lactide: A Mechanistic Study
Kricheldorf, H. R., Kreiser-Saunders, I., & Stricker, A. (2000) · Macromolecules · doi:10.1021/ma991181w · Cited by 467
Self-citationPolylactones: 31. Sn(II)octoate-initiated polymerization of L-lactide: a mechanistic study
Kricheldorf, H. R., Kreiser-Saunders, I., & Boettcher, C. (1995) · Polymer · doi:10.1016/0032-3861(95)93928-f · Cited by 411
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Metadata
- Authors
- Kricheldorf, H. R., & Meier‐Haack, J.
- Venue
- Die Makromolekulare Chemie
- Publisher
- Wiley
- Published
- 1993-02
- Volume
- 194
- Issue
- 2
- Pages
- 715-725
- ISSN
- 0025-116X (ISSN-L)
- OpenAlex
- W2127368182
- Cited by
- 160
- References
- 0
- FWCI
- 4.48
- Type
- journal article
- Language
- en
- Open access
- closed
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- Kricheldorf, H. R., & Meier‐Haack, J. (1993). Polylactones, 22 ABA triblock copolymers of L‐lactide and poly(ethylene glycol). Die Makromolekulare Chemie. https://doi.org/10.1002/macp.1993.021940229
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