A new PDMS macromonomer stabilizer for dispersion polymerization of styrene in supercritical carbon dioxide

Free radical polymerization of styrene in supercritical CO2 requires addition of a surfactant to produce polystyrene (PS) in high conversion and molecular weight with well‐defined particle sizes. In this work, we examined a new stabilizer that can provide effective stabilization for the polymerizati...

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Bibliographic Details
Published in:Journal of applied polymer science 2004-07, Vol.93 (2), p.545-549
Main Authors: Wang, Ruolei, Cheung, H. Michael
Format: Article
Language:English
Subjects:
Applied sciences
carbon dioxide
dispersion
Exact sciences and technology
macromonomer
Physicochemistry of polymers
Polymer industry, paints, wood
polystyrene
stabilization
supercritical
Technology of polymers
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Summary:Free radical polymerization of styrene in supercritical CO2 requires addition of a surfactant to produce polystyrene (PS) in high conversion and molecular weight with well‐defined particle sizes. In this work, we examined a new stabilizer that can provide effective stabilization for the polymerization of styrene. A commercially available poly(dimethylsiloxane) macromonomer has been employed as a stabilizer for dispersion polymerization of PS in scCO2. The reactions were conducted in a 225‐mL stainless steel autoclave over the temperature range 60–80°C and under pressures of 1,500 to 3,000 psi. After 2–12 h of polymerization, the conversion determined by gravimetrical method was between 20 and 80%. These preliminary results suggest that this macromonomer offers satisfactory stabilization for the styrene system. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 545–549, 2004
ISSN:0021-8995
1097-4628
DOI:10.1002/app.20476