Polymer Bulletin

, Volume 14, Issue 6, pp 497–502

Polylactones

6. Influence of various metal salts on the optical purity of poly(L-lactide)
  • Hans R. Kricheldorf
  • Angels Serra
Article

DOI: 10.1007/BF00271606

Cite this article as:
Kricheldorf, H.R. & Serra, A. Polymer Bulletin (1985) 14: 497. doi:10.1007/BF00271606

Summary

L,L-lactide was polymerized in bulk at 120°C, 150 or 180°C by means of various metal oxides, carbonates or carboxylates. Yield, viscosities and optical rotation were measured and compared. Several catalysts enable a nearly complete conversion even at 120°C indicating rapid diffusion of the monomer in the solid reaction mixture. At 180°C only SnO and Sb2O3 proved to be useful catalyst, because they gave within 12 h yields > 80% along with an optical purity around 97%. Longer reaction times lead at 180°C to substantial racemization in all cases.

Copyright information

© Springer-Verlag 1985

Authors and Affiliations

  • Hans R. Kricheldorf
    • 1
  • Angels Serra
    • 1
  1. 1.Institut für Technische und Molekulare Chemie der Universität HamburgHamburg 13Germany