Abstract

A bimodal molecular weight distribution, first predicted theoretically in the Monte Carlo simulation of emulsion crosslinking copolymerization [Macromolecules 27 (1994) 3389], is now confirmed experimentally in emulsion copolymerization of styrene/divinylbenzene, by setting the number of divinylbenzene molecules per primary chain ca. 5. It was found that the locations of these two peaks can be controlled independently, i.e. the location of high molecular weight peak is controlled by the particle size, while that for low molecular weight peak is controlled by the chain lengths of the primary polymer molecules.

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