中文

Journal of Shanghai University（Natural Science Edition） ›› 2013, Vol. 19 ›› Issue (4): 336-339.

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Synthesis and Characterization of High Molecular Weight Poly L-lactic Acid

XU Hong, ZHANG Bao-hua, TENG Cui-qing, YU Mu-huo   

  1. (1. Key Laboratory of Science and Technology of Eco-textile, Ministry of Education, College of Chemistry,
    Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China;
    2. School of Enviornmental and Chemical Engineering, Shanghai University, Shanghai 200444, China;
    3. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science
    and Engineering, Donghua University, Shanghai 201620, China)
  • Online:2013-08-27 Published:2013-08-27

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Abstract: An effective method to prepare high molecular weight poly L-lactic acid (PLLA) is reported. In this new process, a low molecular weight carboxyl terminated prepolymer was synthesized via polycondensation of L-lactic acid and a little adipic acid, and then the molecular weight was increased by a chain-extending reaction using 711 epoxy resin as a chain extender. The effect of synthetic condition, such as reaction temperature and content of the chain extender, on the molecular weight of PLLA was discussed. The average molecular weight was up to 150 000 at an optimum synthetic condition. 1H-NMR and FTIR were used to characterize the polymers and the results indicated that high molecular weight PLLA was synthesized by the reaction between epoxy groups at the end of 711 epoxy resin and carboxyl end groups of PLLA prepolymer.

Key words: chain extension, epoxy resin, poly L-lactic acid (PLLA), prepolymer

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