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Polymerization of lactides and lactones. II. Ring‐opening polymerization of ε‐caprolactone and DL ‐lactide by organoacid rare earth compounds
Author(s) -
Deng X. M.,
Yuan M. L.,
Xiong C. D.,
Li X. H.
Publication year - 1999
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19990321)71:12<1941::aid-app2>3.0.co;2-e
Subject(s) - polymerization , polymer chemistry , ring opening polymerization , monomer , lactide , caprolactone , chemistry , bulk polymerization , materials science , polymer , radical polymerization , organic chemistry
Ring‐opening polymerization of lactone and lactide have been initiated with rare earth organoacid compounds, such as lanthanum acetate in bulk. The polymerization mechanism is in agreement with the “nonionic–coordination–insertion” mechanism, which involves the selective cleavage of the acyl–oxygen bond of the monomer. These organoacid rare earth initiators can give high yield of medium to high molecular weight products. An interesting aspect of this investigation is the good agreement between the performance of the initiator and the solubility of the initiator in the monomer. However, the relatively slow initiation step makes it difficult to control the molecular weight and results in a broad molecular weight distributions. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 71: 1941–1948, 1999