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Inverse microemulsion copolymerization of butyl acrylate and acrylamide: kinetics, colloidal parameters and some model applications
Author(s) -
Yildiz Ufuk,
Capek Ignác,
Berek Dušan,
Sarov Yanko,
Rangelow Ivo W
Publication year - 2007
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.2151
Subject(s) - microemulsion , copolymer , particle size , acrylamide , monomer , polymer chemistry , acrylate , desorption , chemistry , radical polymerization , polymerization , polymer , materials science , organic chemistry , pulmonary surfactant , biochemistry , adsorption
The inverse microemulsion copolymerization of acrylamide and butyl acrylate initiated by ammonium peroxodisulphate, a water‐soluble initiator, and stabilized by anionic emulsifiers sodium bis‐2‐ethylhexylsulfosuccinate and sodium dodecylsulphate (SDS) has been studied. An increase of SDS concentration was observed to increase both the rate of polymerization and the particle size. The average number of radicals per particle ( n̄ ) is much below 0.5, which indicates desorption of monomeric radicals from polymer particles. The exit (desorption) rate constants k ′ des (cm 2 s −1 ) and k des (s −1 ) were evaluated as a function of SDS concentration (or the particle size) according to the Ugelstad/O'Toole (I), Nomura (II) and Gilbert (III) models. The value of k des (s −1 ) decreases with increasing particle size (or SDS concentration) for all three (I, II and III) models. A complex trend appears for k ′ des (cm 2 s −1 ): the Ugelstad/O'Toole model estimates a decrease, the Nomura model finds no variation and the Gilbert model estimates even a slight increase in k ′ des with increasing SDS concentration. Copyright © 2006 Society of Chemical Industry