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Kinetics of ring-opening polymerization of L,L-lactide / Yingchuan Yu in Industrial & engineering chemistry research, Vol. 50 N° 13 (Juillet 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 7927-7940 Titre : Kinetics of ring-opening polymerization of L,L-lactide Type de document : texte imprimé Auteurs : Yingchuan Yu, Auteur ; Giuseppe Storti, Auteur ; Massimo Morbidelli, Auteur Année de publication : 2011 Article en page(s) : pp. 7927-7940 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Polymerization  Kinetics Résumé : The ring-opening polymerization of L,L-lactide with 2-ethylhexanoic acid tin(II) salt as catalyst, and 1-dodecanol as cocatalyst, is investigated at temperatures ranging from 140 to 180 °C and various operating conditions such as different ratios of monomer to catalyst as well as catalyst to cocatalyst amounts. Average molecular weights and byproduct formation have been measured as a function of monomer conversion. A complete kinetic model including intra- and intermolecular transesterifications as well as random chain scission has been developed. All experimental data have been compared with the predictions of the model, which is coherent with the one developed for lower temperature values in a previous work [Yu, Y. C.; Storti, G.; Morbidelli, M. Macromolecules 2009, 42, 8187]. This results in a reliable estimation of the rate coefficients of all involved reactions in a relatively large range of temperatures (130-180 °C). DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332117 [article] Kinetics of ring-opening polymerization of L,L-lactide [texte imprimé] / Yingchuan Yu, Auteur ; Giuseppe Storti, Auteur ; Massimo Morbidelli, Auteur . - 2011 . - pp. 7927-7940. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 7927-7940 Mots-clés : Polymerization  Kinetics Résumé : The ring-opening polymerization of L,L-lactide with 2-ethylhexanoic acid tin(II) salt as catalyst, and 1-dodecanol as cocatalyst, is investigated at temperatures ranging from 140 to 180 °C and various operating conditions such as different ratios of monomer to catalyst as well as catalyst to cocatalyst amounts. Average molecular weights and byproduct formation have been measured as a function of monomer conversion. A complete kinetic model including intra- and intermolecular transesterifications as well as random chain scission has been developed. All experimental data have been compared with the predictions of the model, which is coherent with the one developed for lower temperature values in a previous work [Yu, Y. C.; Storti, G.; Morbidelli, M. Macromolecules 2009, 42, 8187]. This results in a reliable estimation of the rate coefficients of all involved reactions in a relatively large range of temperatures (130-180 °C). DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332117