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Progress in Chemistry 2008, Vol. 20 Issue (10): 1588-1594 Previous Articles   Next Articles

• Review •

Thermal Degradation of Poly(L-lactide) with High Molecular Weight into L-Lactide

Liu Ying1 Wei Rongqing1 Wei Jun1,2 Liu Xiaoning1**   

  1. (1. College of Life Science and Pharmaceutical Engineering, Nanjing University of Technology, Nanjing 210009, China; 2. Institute of scientific & Technical information of China, Beijing 100038, China)
  • Received: Revised: Online: Published:
  • Contact: Liu Xiaoning
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The recent progress of direct recycling of L-lactide from poly L-lactide (PLLA) with high molecular weight through thermal degradation is reviewed. The thermal degradation of pure PLLA proceeds mainly through a random scission reaction, but PLLA thermally degrades with the metal catalyst through a dominant degradatin pathway, producing principally L-lactide. In this paper, not only the mechanism of thermal degradation of polylactide is introduced, but also the kinds of metal catalysts, their influence on L-lactide formation and racemization through thermal degradation of PLLA are referred. Research on the direct recycling of L-lactide from PLLA with high mulecular weight through thermal degradation, which could shorten the recycling use period of PLLA, reduce production cost, make full use of the resources and achieve the development of recycling economy.

Key words: poly(L-lactide), L-lactide, thermal degradation, degradation mechanism, catalysts, racemization

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