Ring-opening polymerization of L-lactic acid O-carboxyanhydrides initiated by alkoxy rare earth compounds

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...

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Bibliographic Details
Published in:Molecules (Basel, Switzerland) Switzerland), 2013-10, Vol.18 (10), p.12768-12776
Main Authors: He, Zhengguo, Jiang, Lin, Chuan, Yongming, Li, Hongli, Yuan, Minglong
Format: Article
Language:English
Subjects:
Amino acids
Anhydrides - chemistry
Calorimetry, Differential Scanning
Furans
l-lactic acid O-carboxyanhydride
Lactic Acid - analogs & derivatives
Lactic Acid - chemistry
Molecular Weight
Neodymium - chemistry
Organometallic Compounds - chemistry
Polymerization
Polymers - chemical synthesis
Ratios
ring-opening polymerization
Solvents
Thermogravimetry
Toluene
triisopropoxyneodymium initiator
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Summary: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.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules181012768