A novel chlorotitanium calix[4]arene complex was synthesized and tested, without activator, as catalyst for the polymerization of L- and rac-lactide under solvent-free conditions. The catalyst displayed high activity, which depended on the monomer-to-catalyst molar ratio, and led to highly isotactic PLLA. Despite concomitant transesterification during the polymerization, polylactide formation was well-controlled, the molar mass distribution indexes remaining in the restricted range of 1.2–1.4.
Ring Opening Polymerization of Lactide underSolvent-Free Conditions Catalyzed by aChlorotitanium Calix[4]arene Complex / M. Frediani; D. Semeril; A. Mariotti; L. Rosi; P. Frediani; L. Rosi; D. Matt; L. Toupet. - In: MACROMOLECULAR RAPID COMMUNICATIONS. - ISSN 1022-1336. - STAMPA. - 29:(2008), pp. 1554-1560. [10.1002/marc.200800383]
Ring Opening Polymerization of Lactide underSolvent-Free Conditions Catalyzed by aChlorotitanium Calix[4]arene Complex
FREDIANI, MARCO;ROSI, LUCA;FREDIANI, PIERO;
2008
Abstract
A novel chlorotitanium calix[4]arene complex was synthesized and tested, without activator, as catalyst for the polymerization of L- and rac-lactide under solvent-free conditions. The catalyst displayed high activity, which depended on the monomer-to-catalyst molar ratio, and led to highly isotactic PLLA. Despite concomitant transesterification during the polymerization, polylactide formation was well-controlled, the molar mass distribution indexes remaining in the restricted range of 1.2–1.4.File | Dimensione | Formato | |
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