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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 (CC BY 3.0).

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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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