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Living ring-opening polymerization of l,l-lactide initiated with potassium t-butoxide and its 18-crown-6 complex

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Summary

Living polymerization of L,L-lactide initiated by potasium t-butoxide and its 18-crown-6 complex was investigated in THF solution at room temperature. The results support a reversible polymerization mechanism consisting of first order in monomer propagation and of unimolecular depropagation. The presence of 18-crown-6 has a strong MWD narrowing effect (Mw/Mn<1.2), slows down the overall rate of polymerization and gives rise to slow initiation. The polymerizations yield optically pure polymers both in the presence and absence of 18-crown-6.

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Authors and Affiliations

  1. Institute of Applied Chemistry, Kossuth Lajos University, H-4010, Debrecen, Hungary

    L. Sipos, M. Zsuga & T. Kelen

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  1. L. Sipos
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  2. M. Zsuga
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  3. T. Kelen
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Sipos, L., Zsuga, M. & Kelen, T. Living ring-opening polymerization of l,l-lactide initiated with potassium t-butoxide and its 18-crown-6 complex. Polymer Bulletin 27, 495–502 (1992). https://doi.org/10.1007/BF00300596

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