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Molecules 2013, 18(10), 12768-12776; doi:10.3390/molecules181012768
Article

Ring-Opening Polymerization of l-Lactic Acid O-Carboxyanhydrides Initiated by Alkoxy Rare Earth Compounds

, , ,  and *
Engineering Research Center of Biopolymer Functional Materials of Yunnan, Yunnan University of Nationalities, Kunming 650500, China
* Author to whom correspondence should be addressed.
Received: 20 August 2013 / Revised: 28 September 2013 / Accepted: 30 September 2013 / Published: 15 October 2013
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Abstract

The ring-opening polymerization of l-lactic acid O-carboxyanhydrides was initiated by triisopropoxyneodymium in toluene-THF mixtures. Typically, high yields and relatively high molecular weight PLAs were obtained within 4 h at 25 °C. The reaction was highly controllable and easy to conduct, and the molecular weight distribution of the PLAs was rather narrow (Mw/Mn = 1.10–1.36). NMR analysis showed that one end of the PLA chain consisted of an isopropoxy group, while the other end of the chain contained a hydroxyl group. Due to their availability and high polymerizability, Lac-OCAs are promising monomers for the preparation of tailored architectures derived from well-defined PLAs.
Keywords: l-lactic acid O-carboxyanhydride; ring-opening polymerization; triisopropoxyneodymium initiator l-lactic acid O-carboxyanhydride; ring-opening polymerization; triisopropoxyneodymium initiator
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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He, Z.; Jiang, L.; Chuan, Y.; Li, H.; Yuan, M. Ring-Opening Polymerization of l-Lactic Acid O-Carboxyanhydrides Initiated by Alkoxy Rare Earth Compounds. Molecules 2013, 18, 12768-12776.

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