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Characteristics and mechanism of L-lactide polymerization using N-heterocyclic carbene organocatalyst

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Abstract

An organocatalytic approach to ring-opening polymerization using N-heterocyclic carbene as nucleophilic catalyst is detailed. The influences of monomer/initiator molar ratio ([M]/[I]), monomer/catalyst molar ratio ([M]/[C]), monomer concentration, as well as polymerization temperature and time on the polymerization have been investigated. The detailed kinetic study of L-lactide (LLA) polymerization has indicated that the polymerization rate is first-order with respect to both monomer and catalyst concentrations,respectively. The apparent activation energy amounts to 50.4 kJ mol−1. Poly(L-lactide) (PLLA) was characterized by 1H NMR, GPC and IR. These results indicate that the proposed mechanism is a monomer-activated process.

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Acknowledgments

This project is financially supported by the Natural Science Foundation of Shanxi Province, China (2006011069 and 2011011006–4); the Opening Foundation of Key Laboratory of Shanxi Province, China (2009011059–7); the Research Fund for the Education Department of Shanxi Province (2010111).

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Authors and Affiliations

  1. Institute of Material Chemistry, Shanxi Normal University, Linfen, 041004, People’s Republic of China

    Yan Wang, Lifang Zhang, Xingna Guo, Rui Zhang & Junfei Li

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  1. Yan Wang
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  2. Lifang Zhang
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  3. Xingna Guo
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  4. Rui Zhang
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  5. Junfei Li
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Correspondence to Lifang Zhang or Junfei Li.

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Wang, Y., Zhang, L., Guo, X. et al. Characteristics and mechanism of L-lactide polymerization using N-heterocyclic carbene organocatalyst. J Polym Res 20, 87 (2013). https://doi.org/10.1007/s10965-013-0087-7

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