Investigation of heterogeneous radical polymerization of methyl methacrylate with polydimethylsiloxane as stabilizing agent in supercritical CO 2  by turbidimetry | Zendy

Fehrenbacher U. | Zendy; Ballauff M. | Zendy; Muth O. | Zendy; Hirth T. | Zendy

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Investigation of heterogeneous radical polymerization of methyl methacrylate with polydimethylsiloxane as stabilizing agent in supercritical CO 2 by turbidimetry

Author(s) -

Fehrenbacher U.,

Ballauff M.,

Muth O.,

Hirth T.

Publication year - 2001

Publication title -

applied organometallic chemistry

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.53

H-Index - 71

eISSN - 1099-0739

pISSN - 0268-2605

DOI - 10.1002/aoc.177

Subject(s) - chemistry , dispersion polymerization , polymerization , supercritical fluid , methyl methacrylate , polymer chemistry , polydimethylsiloxane , polymer , turbidimetry , particle (ecology) , supercritical carbon dioxide , radical polymerization , chemical engineering , chromatography , organic chemistry , engineering , geology , oceanography

Experimental results of a turbidimetric in situ investigation of the heterogeneous radical polymerization (dispersion polymerization) of methyl methacrylate and polydimethylsiloxane–monomethacrylate in supercritical carbon dioxide are presented. The experiments were carried out at 60 °C and 330 bar. Turbidity spectra were measured directly in the autoclave to determine the average particle diameter σ τ and the particle density N AV / V during the first five minutes of polymerization. The results show that the particle density increased until a maximum was achieved, whereas the particle diameter increased during the first stage. Moreover, a comparison with kinetic data suggests that the particles nucleate through coagulation of polymer that is formed in the homogeneous phase. Copyright © 2001 John Wiley & Sons, Ltd.

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