Consequences of monomer partitioning for the copolymer composition

When both monomers are sparsely water soluble, for example, the monomer pairs styrene-butadiene and styrene— -butyl acrylate, the effect of the monomer to water ratio on the monomer composition in the droplet phase as well as in the particle phase is negligible. So for sparsely water-soluble monomer pairs, the monomer to water ratio has hardly any influence on the instantaneous and cumulative copolymer composition. 

As a conclusion, it can be stated that for monomer pairs of which one monomer is sparsely water soluble and one is moderately water soluble or even completely miscible with water, the concentration ratio of the monomers in the particle phase strongly depends on the volume ratio of the phases involved. However, the effect of the monomer to water ratio, M/W, is only important for too small values of A4/W. Thus, for industrial recipes M/W 1 and the influence of M/W on the copolymer composition will be negligible. 

If a completely water-miscible monomer is involved in the copolymerisation, for example, acrylic acid or 2-hydroxyethyl methacrylate (HEMA), simple relations between volume 

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