SynopsisThe rheological behavior of the two-phase systems consisting of a polystyrene-irtstyrene phase distributed in a rubber-in-styrene phase is shown to exhibit increasing IIOIINewtouiari behavior up to the phase inversion point, as a consequence of its two phase nature. The equation is recommended for the prediction of the viscosity of the polymerizing mass up to phase inversion during the production of HIPS by the in situ bulk polymerization of styrene in the presence of dissolved rubber.

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SynopsisPhase inversion of the two-phase system consisting of a polystyrene-in-styrene phase distributed in a rubber-in-styrene phase is shown only to occur above a minimum shear rate, which is experimentally determined for a range of rubber concentrations. The conditions for agitation of the system to give a smooth and nondelayed inversion point, are separated into meeting two requirements, one of which is related to mass transfer to t,he discontinuous phase and the other, to meeting the shear requirement; these are discussed in t,erms of the known rheological behavior of the .system.