[en] The ring-opening polymerization of lactides has been studied in bulk using either 2-ethylhexanoic acid tin(II) salt, Sn(Oct)2, or aluminum triisopropoxide, Al(OiPr)3, as the initiator over a wide range of temperature and monomer-to-initiator molar ratio, A high increase in the bulk polymerization rate has been observed when the initiator was added with an equimolar amount of a Lewis base, such as triphenylphosphine and 4-picoline (C6H7N) added to Sn(Oct)2 and Al(OiPr)3, respectively Melt stable polylactides of high molecular weight and reasonably narrow molecular weight distribution have been accordingly prepared. The use of the Sn(Oct)2. equimolar combination has allowed for reaching an acceptable balance between propagation and depolymerization rates, so that the polymerization is fast enough to be performed through a continuous single-stage process in a twin-screw extruder A global activation mechanism is proposed and discussed by comparison with both investigated initiation systems.
Research Center/Unit :
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Materials science & engineering Chemistry
Author, co-author :
Degée, Philippe; University of Mons-Hainaut (UMH) > Laboratory of Polymeric and Composite Materials
Dubois, Philippe ; University of Mons-Hainaut (UMH) > Laboratory of Polymeric and Composite Materials
Jérôme, Robert ; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Jacobsen, Sven; University of Stuttgart > Institut für Kunststofftechnologie
Fritz, Hans-Gerhard; University of Stuttgart > Institut für Kunststofftechnologie
Language :
English
Title :
New catalysis for fast bulk ring-opening polymerization of lactide monomers
Publication date :
October 1999
Journal title :
Macromolecular Symposia
ISSN :
1022-1360
eISSN :
1521-3900
Publisher :
Wiley-V C H Verlag Gmbh, Weinheim, Germany
Volume :
144
Pages :
289-302
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique CE - Commission Européenne
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