Influence of CO 2  on ultrasound‐induced polymerizations in high‐pressure fluids | Zendy

Kuijpers M. W. A. | Zendy; Jacobs L. J. M. | Zendy; Kemmere M. F. | Zendy; Keurentjes J. T. F. | Zendy

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Influence of CO 2 on ultrasound‐induced polymerizations in high‐pressure fluids

Author(s) -

Kuijpers M. W. A.,

Jacobs L. J. M.,

Kemmere M. F.,

Keurentjes J. T. F.

Publication year - 2005

Publication title -

aiche journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.958

H-Index - 167

eISSN - 1547-5905

pISSN - 0001-1541

DOI - 10.1002/aic.10464

Subject(s) - polymerization , viscosity , methyl methacrylate , polymer chemistry , radical polymerization , kinetics , chemistry , cavitation , ultrasound , materials science , chemical engineering , polymer , thermodynamics , organic chemistry , composite material , physics , quantum mechanics , acoustics , engineering

A strong viscosity increase upon polymerization hinders cavitation and subsequent radical formation during an ultrasound‐induced bulk polymerization. Ultrasound‐induced radical polymerizations of methyl methacrylate (MMA) have been performed in CO 2 ‐expanded MMA, as well as in bulk MMA. For this purpose, the phase behavior of CO 2 /MMA systems has been determined. With temperature oscillation calorimetry, the influence of CO 2 on the viscosity and on the reaction kinetics of ultrasound‐induced polymerizations of MMA has been studied. In contrast to polymerizations in bulk, this technique shows that a low viscosity is maintained during polymerization reactions in CO 2 ‐expanded MMA. As a consequence, a constant or even increasing polymerization rate is observed when pressurized CO 2 is applied. © 2005 American Institute of Chemical Engineers AIChE J, 2005

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