Results 241 to 250 of about 501,741 (292)

Chlorotrifluoroethylene Suspension Polymerization

2002
Polychlorotrifluoroethylene (PCTFE) is ordinarily prepared by emulsion polymerization. A polymer suitable for thermal processing requires coagulation, extensive washing, and postpolymerization workup. Coagulation to provide a filterable and washable solid is a slow, difficult process and removal of surfactant is an important part of it.
Milton H. Andrus, Robert J. Olsen, Gilbert L. Eian, Richard C. Allen   +3 more
openaire   +1 more source

Semi‐suspension polymerization process

Macromolecular Symposia, 1996
AbstractA novel heterogeneous polymerization process for synthesizing particulate with a wide range of properties has been developed. This process, which is called semi ‐ suspension polymerization (SSP), consists of two steps. In the first step a mixture of monomer, polymer, initiator, and other required ingredients is prepared by means of a non ...
Hadi K. Mahabadi, Denise Wright
openaire   +1 more source

DROP DISPERSION IN SUSPENSION POLYMERIZATION

Chemical Engineering Communications, 1982
Four models, two based on laminar shear and two based on turbulent flow, are proposed to describe drop dispersion in non-coalescing systems. The models predict the largest surviving drop size dmax as a function of geometry, speed and physical property variables. Laboratory data including suspension polymerization runs support the boundary layer laminar
D.E. LENG, G.J. QUARDERER
openaire   +1 more source

Inverse suspension polymerization of acrylamide

European Polymer Journal, 1982
Abstract The polymerization of acrylamide in inverse suspension is described and compared with polymerization in solution. The influences of various factors upon the molecular weight of the polymer were studied, viz. the concentration of initiator, the procedure of aqueous phase addition, the nature and concentration of emulsifier, the salt ...
M.V. Dimonie, C.M. Boghina, N.N. Marinescu, M.M. Marinescu, C.I. Cincu, C.G. Oprescu   +5 more
openaire   +1 more source

Inverse suspension polymerization of acrylamide

Polymer Science U.S.S.R., 1991
Abstract The effect of the concentrations of acrylamide, potassium persulphate, initiator, ethoxylated anhydrosorbitol stearate emulsifier, and the aqueous phase/toluene phase ratio on the kinetic relationships of the inverse suspension polymerization of acrylamide was studied by thermometry.
L.L Stupenkova, T.A Baiburdov, V.F Gromov, E.N Teleshov   +3 more
openaire   +1 more source

Acrylonitrile polymerization in aqueous suspension

Journal of Polymer Science, 1957
AbstractPolymerization of acrylonitrile in dilute aqueous solution initiated by the chloratesulfite redox was studied kinetically and with the aid of the electron microscope. Polymerization rate depended on the [ClO] [H2SO3] product, the monomer content and the sodium lauryl sulfate concentration.
W. M. Thomas, E. H. Gleason, G. Mino
openaire   +1 more source

Morphology of suspension polymerized polyacrylamide

Journal of Materials Science Letters, 1985
In the course of studies on the characterization of commercial polyacrylamides used in tertiary oil recovery, samples of BASF Sepaflood suspension polymerized polyacrylamide with varying degrees of hydrolysis were observed using a Hitachi S-450 scanning electron microscope. Figs !
openaire   +1 more source

Aqueous Suspension Polymerizations

1989
Polymerization processes in heterogeneous systems are of considerable interest because they offer many practical advantagesin industrial applications.1,2 Among these heterogeneous processes are emulsion and suspension polymerizations of monomers dispersed in an aqueous phase.
openaire   +1 more source

Suspensions of rigid spherical particles in polymeric solutions

Physica A: Statistical Mechanics and its Applications, 2007
Abstract Suspensions of solid particles in polymeric solutions are regarded as suspensions of solid particles and polymer molecules in a Newtonian fluid. Disturbances caused by the particles propagate in the Newtonian fluid and influence the distribution of the particles and conformation of the molecules.
V. Zmievski, M. Grmela, M. Bousmina
openaire   +2 more sources

Viscosity of suspensions in polymeric solutions

Rheologica Acta, 1983
Viscosities of suspended particles in polymeric solutions depend upon dissolved polymer concentration, volume fraction of particles and shear rate. In this analysis of viscosity data, relative viscosity was defined as the ratio of suspension viscosity to solution viscosity at the same shear stress rather than shear rate.
openaire   +1 more source