NDLI: Imidazoline derivatives as promising cationic emulsifiers for styrene heterophase polymerization

Content Provider	Springer Nature Link
Author	Gritskova, I. A. Levachev, S. M. Kharlov, A. E. Bondarev, A. N. Kadantseva, A. I. Shestakov, A. M.
Copyright Year	2011
Abstract	The colloidochemical properties of new cationic surfactants synthesized from fatty acids of palm oil and diethylenetriamine are first studied. It is found that, at solution pH below 6.0, the examined surfactants exist mainly as salts formed from protonated surfactant molecules and residues of strong acids, e.g., hydrochloric acid. In the pH range above 7.0, the protonated and nonprotonated forms of the surfactants are at equilibrium, which shifts to the nonprotonated form with an increase in pH. The analysis of interfacial tension isotherms shows that the minimum values of the interfacial tension are achieved at pH 7.0 when the concentrations of the protonated and nonprotonated forms of surfactant molecules are equal. New cationic surfactants are used as emulsifiers in emulsion polymerization of styrene. It is found that stable polystyrene latexes with narrow particle size distributions and high positive ζ potentials (as high as +68.4 mV) can be obtained at styrene concentration in an initial emulsion of 25 vol % and surfactant concentration in an aqueous phase of 2 wt %. A hydrogen peroxide-iron(II) salt redox system is used as an initiator of polymerization at component concentrations equal to 5 and 0.05 wt % of the monomer, respectively.
Starting Page	777
Ending Page	783
Page Count	7
File Format	PDF
ISSN	1061933X
Journal	Colloid Journal
Volume Number	73
Issue Number	6
e-ISSN	16083067
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2011-11-27
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polymer Sciences Surfaces and Interfaces, Thin Films
Content Type	Text
Resource Type	Article
Subject	Colloid and Surface Chemistry Physical and Theoretical Chemistry Surfaces and Interfaces

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