Abstract
AbstractA systematic study of the kinetics of styrene emulsion polymerization in the postnucleation stage by the way of seed particle growth of monodisperse latices was undertaken, in which the colloidally important parameters were varied: Rp was independent (within limits) of (a) ionic strength, (b) pH, (c) initiator concentration (potassium persulfate), and (d) surfactant (sodium dodecyl sulfate) concentration; Rpp was independent (within limits) of (a) seed particle number concentration N, (b) oil:water phase ratio, and (c) monomer:polymer ratio; Rp was directly proportional to seed‐particle surface area. The viscosity average molecular weight of the polymer formed during interval II, Mv(i–j), was approximately constant and increased linearly with N. Log Mv(i–j) was inversely proportional to reaction temperature; Mv(i–j) was inversely proportional to initiator concentration. The overall activation energy of polymerization E′p was equal to the activation energy of propagation Ep during interval II. The value of kp at 60°C was 615 dm3 mol−1 s−1. Trace of oxygen seems to affect the average number of radicals per particle ī during interval II polymerization.
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