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- W2007124413 abstract "Poly(L-lactic acid) (PLLA) is generally produced by ring-opening polymerization of (S,S)-lactide, which is prepared from dehydration polycondensation of lactic acid and successive depolymerization. Results of this study show that scandium trifluoromethanesulfonate [Sc(OTf)3] and scandium trifluoromethanesulfonimide [Sc(NTf2)3] are effective for one-step dehydration polycondensation of L-lactic acid. Bulk polycondensation of L-lactic acid was carried out at 130–170 °C to give PLLA with Mn of 5.1 × 104 to 7.3 × 104 (yield 32–60%). The solution polycondensation was performed at 135 °C for 48 h to afford PLLA with Mn of 1.1 × 104 with good yield (90%). In no case did 1H NMR, specific optical rotation, or DSC measurement confirm racemizations. The catalyst was recovered easily by extraction with water and reused for polycondensation. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 5247–5253, 2006" @default.
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- W2007124413 date "2006-01-01" @default.
- W2007124413 modified "2023-10-16" @default.
- W2007124413 title "Direct dehydration polycondensation of lactic acid catalyzed by water-stable Lewis acids" @default.
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- W2007124413 doi "https://doi.org/10.1002/pola.21639" @default.
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