Stability of the polymerizable surfactant stabilized latex particles during semibatch emulsion polymerization |
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Authors: | C S Chern Y C Chen |
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Institution: | (1) Department of Chemical Engineering, National Taiwan Institute of Technology, 43 Keelung Road, Section 4, Taipei 106, Taiwan, Republic of China |
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Abstract: | The effect of the polymerizable surfactant, sodium dodecyl allyl sulfosuccinate (JS-2), on the stability of polybutyl acrylate
latex particles during semibatch emulsion polymerization was investigated in this work. Experimental data show that the ionic
strength is the most important parameter in determining the latex stability during the reaction. Both the amount of coagulum
produced by intensive coagulation and percentage of the particle volume change (ΔV) caused by limited flocculation increase with increasing electrolyte concentration. The parameter Δ V increases significantly when the concentration of JS-2 in the initial reactor charge (JS-2]i) increases. The amount of coagulum increases rapidly when the agitation speed is increased from 400 to 800 rpm. Experiments
of coagulation kinetics were carried out to study the stability of latex products toward added salts. The experimental data
show that the chemical stability of the latex product increases with increasing pH. Furthermore, the critical coagulation
concentration and diffuse potential increase with increasing JS-2]i. It is postulated that the increasing electrostatic attraction force between two approaching particles due to the increased
JS-2] i can increase the apparent magnitude of Hamaker constant. |
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Keywords: | Latex stability polymerizable surfactant semibatch emulsion polymerization coagulation kinetics |
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