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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.