green technology; supercritical carbon dioxide; ring-opening polymerization (ROP); lactone
Abstract :
[en] The ring-opening polymerization of ε-caprolactone (CL) initiated by dibutyltin dimethoxide was studied in supercritical carbon dioxide at 40 °C, under a pressure of 210−215 bar. The polymerization is controlled as assessed by the linear dependence of Mn,SEC on conversion and of ln([CL]0/[CL]) on time. Moreover, there is a good agreement between Mn,SEC and Mn,calc, at least until 20 000 g/mol. The apparent rate constants of polymerization in different media increase as follows: sc CO2, CFC-113, toluene, bulk. The kinetic order in initiator for the polymerization in solution and in sc CO2 was extracted from the slope of ln kapp vs ln [Sn]0. It appears to depend on the initiator concentration in solution, which is not the case in sc CO2.
Research Center/Unit :
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Materials science & engineering Chemistry
Author, co-author :
Stassin, Fabrice; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Halleux, Olivier; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Jérôme, Robert ; Université de Liège - ULiège > Centre d'études et de rech. sur les macromolécules (CERM)
Language :
English
Title :
Ring-opening polymerization of epsilon-caprolactone in Supercritical Carbon Dioxide
Publication date :
13 February 2001
Journal title :
Macromolecules
ISSN :
0024-9297
eISSN :
1520-5835
Publisher :
Amer Chemical Soc, Washington, United States - Washington
BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE] The European Community in the frame of the Brite Euram Project BE 97-4520 BRPR-CT97-0503
