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ABSTRACT
Kinetics of seeded emulsion polymerization of styrene at 90°C was studied, n calculated using both Rp = kpCnN/NA and n - (a/4) (I0(a)/I1(a)) agreed very well with each other and indicated a significant gel effect even under relatively monomer-rich conditions. However, significant deviation of n values occurred in starved runs with slower monomer addition. Under these conditions, diffusion of monomer through the polymer matrix became rate limiting. A monomer-rich shell as the main polymerization site was deduced from the rate data and the thickness of the shell was estimated