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Highly crystalline as-polymerized poly(l-lactide)

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Summary

Two new lactone polymerization catalysts, tin(II)-bis(2,4-pentanedionato-O,O') (Zn(Acac)2) and zinc-bis(2,2-dimethyl-3,5-heptanedionato-O,O') (Zn(DMH)2), together with tin(II)-2-ethylhexanoate (Sn(Oct)2), were used to study the effect of the catalyst in the L-lactide polymerization on the nascent polymer structure. Using Zn(DMH)2 an ultra high crystalline polymer was obtained with a ΔHm of 100 J.g-1. Independent of the catalyst and the crystallinity the structure of the crystalline polymer was a pure α-structure as revealed by WAXS-measurements. SAXS-measurements showed a long period for both the Sn(Oct)2 and the Zn(DMH)2 polymer of about 33 nm., the latter revealing a more complex highly regular structure with up to fourth-order reflections. SEM micrographs showed a fibrillar like structure for the Zn(DMH)2 polymer.

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Authors and Affiliations

  1. Laboratory of Polymer Chemistry, University of Groningen, Nijenborgh 16, NL-9747, Groningen, The Netherlands

    A. J. Nijenhuis, D. W. Grijpma & A. J. Pennings

Authors
  1. A. J. Nijenhuis
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  2. D. W. Grijpma
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  3. A. J. Pennings
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Nijenhuis, A.J., Grijpma, D.W. & Pennings, A.J. Highly crystalline as-polymerized poly(l-lactide). Polymer Bulletin 26, 71–77 (1991). https://doi.org/10.1007/BF00299350

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