The composition of the latex particles during intervals I and II of the emulsion polymerization of styrene and butadiene (initial weight ratio 71 parts butadiene:29 parts styrene) has been determined at 5, 15, and 25°C. The monomer content of the latex particles diminishes linearly with conversion. The composition ratio (weight styrene: weight butadiene inside the particles divided by weight styrene:weight butadiene in the binary phase) also decreases with conversion, the decrease being particularly marked as the end of interval II is approached. It is shown that the assumptions embodied in the theory of Medvedev et al. are incorrect. The results are compared with the recent theories of Gardon.
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Burnett et al. (1970) studied this question.
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