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Catalytic ring-opening polymerization of l-lactide by titanium biphenoxy-alkoxide initiators

✍ Scribed by P.S. Umare; G.L. Tembe; K.V. Rao; U.S. Satpathy; B. Trivedi

Publisher: Elsevier Science
Year: 2007
Tongue: English
Weight: 792 KB
Volume: 268
Category: Article
ISSN: 1381-1169
DOI: 10.1016/j.molcata.2006.12.028

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✦ Synopsis

Six different titanium biphenolate complexes were synthesized and investigated as initiators for the ring opening polymerization of l-lactide in the bulk phase but typically below the degradation temperature of the monomer. All the titanium complexes are effective in forming polylactide with good conversions. The nature and steric bulk of the phenolic ligands coordinated to the central titanium greatly influence polymer properties. In all cases the PLA obtained display low molecular weights and narrow disperisities. Both 1 H and 13 C NMR spectra indicate the polymers to be essentially isotactic in nature. High crystallinity and controlled morphology of polylactides are uniquely different compared to conventional high molecular weight PLA obtained with tin based initiator.

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