Abstract
AbstractThe chemical homogeneity of copolymer latex particle populations was studied as a function of polymerization conditions. The comonomer system chosen was styrene–butadiene, and the polymerization variables included the comonomer addition rate and the amount of emulsifier introduced during the reaction. It was found that under conditions of variable comonomer addition rate and with introduction of excess emulsifier during the reaction, a bidisperse latex is produced which contains two chemically distinct particle populations. These populations were separated from one another using a centrifugation technique reported recently and were characterized by electron microscopy and chemical analysis. Each particle population was relatively monodisperse with respect to particle size and differed from its counterpart with respect to average particle size and comonomer ratio. Other combinations of the polymerization variables mentioned above yielded latices with chemically homogeneous particle populations.
Published Version
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