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Kinetics and mechanism of styrene-acrylonitrile copolymerization in micro-emulsion

✍ Scribed by Paresh G Sanghvi; Naveen Kumar Pokhriyal; P A Hassan; Surekha Devi

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
196 KB
Volume
49
Category
Article
ISSN
0959-8103

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✦ Synopsis

Stable and transparent poly(styrene-acrylonitrile) latexes were produced by the polymerization of styrene-acrylonitrile in ternary o/w micro-emulsions containing sodium dodecyl sulfate as an anionic surfactant. Kinetics of copolymerization was studied at different temperatures using different concentrations of potassium persulfate and hydrogen peroxide/ascorbic acid. The suitability of existing model for homopolymerization was examined for styrene-acrylonitrile copolymerization after appropriate modi®cation. The latexes were characterized for particle size and number of particles by dynamic light scattering and TEM. The isolated products were characterized by 1 H and 13 C NMR as well as by thermal analysis. The overall size of particles was found to be between 15 and 20 nm.

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