Competitive growth experiment

Cloud point 52, 53 Coagulum 47, 53 Coating, graft copolymers 32 Competitive growth experiment 49 Crq)oly(styrene-dimethylacrylamide) 19 Cumyloxy free radicals 71 Cyanoisopixqtyl free mono-madicals 88, 94-96... 

Seeded polymerization using a monodisperse seed latex allows the preparation of larger monodisperse latexes of different size (31). Indeed, such polymerizations can give sharpening of the particle size distribution (32,33). This self-sharpening tendency can be seen in competitive growth experiments (33,34) in which a mixture of two monodisperse latexes is used as the seed latex, so that the different-size particles compete for the available monomer and free radicals. Assuming that the rate of increase of the particle volume V with time is proportional to some power of the particle diameter... 

In some cases competitive growth experiments are used to study reaction kinetics. In such systems one must be able to predict relative growth, but the individual populations are usually easy to identify and track. When batch and/or semi-continuous reactors are operated in such a manner as to produce a broader PSD the kinetic analysis becomes more complex. Hence not much work has been reported for such systems. 

One of the tests described for the relative stability of polymorphs (Sections 3.5.1 and 4.12) involves the observation of competitive growth rates in a particular solvent (Fig. 1.4). Such experiments may be easily followed and recorded on the microscope (at different temperatures) as demonstrated in Fig. 3.5. 

On the other hand Kao et al. [86] concluded on the basis of simulations that discrimination would not be possible from the results of batch experiments but that experimental results on the semi-continuous emulsion polymerization of styrene (Figure 4.6) fitted their model based on collisional entry. Moreover this hypothesis led to Rp a as found by Vanderhoff et al. [87] in competitive particle growth experiments published 28 years earlier. However, their value of... 

The reason for the absence of an additive response to nicotinic acid plus nicotinamide, seen with whole blood and in recovery experiments, remains obscure. Nicotinic acid and nicotinamide seem to interfere with each other s utilization. There may exist a competition between nicotinic acid and nicotinamide for methylation growth therefore would not reach an algebraic sum when the two are combined because of the limited number of methyl groups available for these compounds. 

---