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Propagation rate coefficients in free‐radical homopolymerizations of butyl methacrylate and dodecyl methacrylate
Author(s) -
Buback Michael,
Geers Ute,
Kurz Caroline H.,
Heyne Joachim
Publication year - 1997
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1997.021981110
Subject(s) - methacrylate , polymer chemistry , polymerization , chemistry , radical polymerization , methyl methacrylate , photopolymer , analytical chemistry (journal) , polymer , organic chemistry
Propagation rate coefficients ( k p ) for the homopolymerizations of butyl methacrylate (BMA) and dodecyl methacrylate (DMA) were determined by the pulsed laser polymerization (PLP)/size‐exclusion chromatography (SEC) technique. At amibient pressure, the polymerizations of BMA and DMA were studied between −20 and 50°C and between 9 and 60 °C, respectively. For DMA the pressure dependence of propagation rate has been measured up to 1500 bar. The propagation rate coefficients of three major methacrylates (MMA, BMA, DMA) are available over an extended pressure and temperature range. The k p data at identical pressure p and temperature T are close to each other and exhibit a very pronounced family‐type behaviour with respect to both pressure and temperature dependence. The uncertainty of experimental data is estimated to be ± 10 per cent. The imperfect knowledge of the Mark‐Houwink coefficients may give rise to an increased error for the BMA and DMA data which should, however, stay below ± 20 per cent.