Summary
Polystyrene latices were polymerized in the absence of any emulsifiers using potassium persulphate as an initiator. The latex dispersions obtained consisted of particles having high monodispersity and their diameters could be varied within a wide range (350 to 1400 mμ) in response to the preparing conditions.
The electrophoretic mobilities of the latices were measured according to a microelectrophoretic technique and their zeta-potential was obtained as 70–80 mV in the standard state.
Average molecular weights and the distributions of the latices were determined by use of the Gel Permeation Chromatography and the mechanism of the particle growth was discussed.
The critical flocculation concentrations for the latex dispersion were determined with the various salts (KCl, BaCl2 and LaCl2) by measuring sedimentation rates. These results were discussed byVerwey-Overbeek's analytical expression for the flocculation concentration.
Zusammenfassung
Die Polystyrol-Latices wurden ohne Emulgatoren mit Kaliumpersulfat als initiator polymerisiert. Die erhaltenen Polystyroldispersionen waren monodispers; der Durchmesser der Partikel konnte im großen Bereich (350 to 1400 mμ) variiert werden.
Die elektrophoretische Beweglichkeit der Latices wurde mikroelektrophoretisch gemessen; das Zetapotential lag zwischen 70 und 80 mV. Die mittleren Molekulargewichte und die Verteilungskurven wurden durch Geldurchdringungschromatographie bestimmt. Die kritische Auflockerungskonzentration für die Polystyroldispersion wurde mit verschiedenen Salzen (KCl, BaCl2 und LaCl3) bestimmt. Die Ergebnisse werden mit der Verwey-Overbeek-Theorie diskutiert.
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Kotera, A., Furusawa, K. & Takeda, Y. Colloid chemical studies of polystyrene latices polymerized without any surfaceactive agents. Kolloid-Z.u.Z.Polymere 239, 677–681 (1970). https://doi.org/10.1007/BF02085916
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DOI: https://doi.org/10.1007/BF02085916