Ugelstad plot

The values predicted by Eq. 51 agree well with those predicted by Eq. 49 within less than 4%. This type of plot is called a Ugelstad plot and has been applied as a criterion to determine whether a system under consideration obeys either zero-one kinetics (n<0.5) or pseudo-bulk kinetics (n>0.5). 

An example of a successful application of the Ugelstad plot to determine some of the rate coefficients involved in emulsion polymerization was pre-... 

Figure 4 is a typical plot of log vs log a for a CSTR. This figure is analogous to the Ugelstad plots except for the... 

Ugelstad et al. (1967) solved tbe simultaneous equations Eqs. (21) and (26) for ft and plotted the calculated value of n against tbe value of a at fixed value of Y, varying tbe value of m as a parameter. Since the radical termination in the water phase is negligible under normal emulsion polymerization conditions as mentioned in Section 1I,A, the condition F = 0 is most important for usual emulsion polymerizations. Figure I shows a plot of... 

Fig. 4. Stockmayer s eqantion plotted ns logn as a function of log a (Ugelstad and Hansen, i976).m = 0 a = p,t>/Nk,.

Figure 4 shows the influence of radical desorption from particles (the parameter y) on . The shape of the curves are, as expected, quite similar to those reported by Ugelstad et al. In this case two parameters, 3 and Y, are fixed. Dubner et al. also report that the radical desorption rate (as accounted for by y) could have a very substantial influence on the PSD of the CSTR effluent latex. Figure 5 illustrates this effect. The distributions are plotted in terras of a dimensionless diameter, that is, particle diameter divided by seed-particle diameter. 

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