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

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.

Published in:
Macromolecular Symposia, 206, Polymer Reaction Engineering V, 79-92
CAN 140:357777
Chemistry of Synthetic High Polymers
Institute of Chemical and Biological Process Science,Swiss Federal Institute of Technology,Lausanne,Switz.
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)
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 Record created 2009-02-09, last modified 2020-07-30

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