A new tool for the study of polymerization under supercritical conditions - preliminary results

• Published in: Macromolecular Symposia, vol. 206, num. Polymer Reaction Engineering V, p. 79-92
• Publication date: 2004

Efficient stirring is needed to realize heat flow anal. with a thermally homogeneous medium. Because dispersion polymn. with supercrit. fluids can be destabilized under stirring, a preliminary target has been to find a compromise between synthesis and basic reaction calorimetry requirements. This paper describes the use of poly(dimethylsiloxane) macromonomer with a mol. wt. 5000 g/mol as stabilizer for the dispersion polymn. of Me methacrylate in supercrit. carbon dioxide. The effect of stirring speed and stabilizer concn. has been examd. This study has shown that PMMA can be produced at high yield and mol. wt. using 10 wt. % (with respect to monomer) PDMS macromonomer at stirring speeds up to 600 rpm. A polymn. enthalpy of -57.6+-2 kJ/mol has been calcd. being in good agreement with previously reported data. Thus, preliminary results for the heat balance using the newly developed high pressure reaction calorimeter for supercrit. fluid applications have shown the important potential of reaction calorimetry to promote supercrit. fluid technologies at industrial scale allowing for the detn. of kinetics and thermodn. and safety data, resp.

Keywords: Molecular weight; Molecular weight distribution (of PMMA; tool for study of polymn. of MMA under supercrit. conditions using PDMS as stabilizer); Polymerization enthalpy; Supercritical fluids (tool for study of polymn. of MMA under supercrit. conditions using PDMS as stabilizer); Polysiloxanes Role: NUU (Other use ; unclassified) ; USES (Uses) (tool for study of polymn. of MMA under supercrit. conditions using PDMS as stabilizer) ; methyl methacrylate polymn supercrit fluid carbon dioxide PDMS stabilizer

Note:

CAN 140:357777

35-4

Chemistry of Synthetic High Polymers

Institute of Chemical and Biological Process Science,Swiss Federal Institute of Technology,Lausanne,Switz.

Journal

1022-1360

written in English.

124-38-9 (Carbon dioxide); 9016-00-6 (Poly[oxy(dimethylsilylene)]); 31900-57-9 (Dimethylsilanediol homopolymer) Role: NUU (Other use, unclassified), USES (Uses) (tool for study of polymn. of MMA under supercrit. conditions using PDMS as stabilizer); 9011-14-7P (PMMA) Role: SPN (Synthetic preparation), PREP (Preparation) (tool for study of polymn. of MMA under supercrit. conditions using PDMS as stabilizer)

Reference

• GSCP-ARTICLE-2004-003
• doi:10.1002/masy.200450207
• View record in Web of Science

Record created on 2009-02-09, modified on 2017-05-12