Particle size measurement of the dispersed phase in rubber modified polystyrene

摘要

AbstractA widely accepted method for determining the particle size of the dispersed phase in impact polystyrene is by the microscopic examination of microtomed sections or dilute solutions of the polymer. Although this technique is relatively quick, it has obvious shortcomings to its statistical relaibility. In an effort to obtain more meaningful data, a Coulter Counter was employed to measure the average particle size and particle size distribution of the dispersed phase in a number of impact polystyrene samples. The materials examined contained rubber particles ranging from one to twenty microns in diameter. It was found that the weight average distribution of these particles was most nearly described by a log‐normal probability function. The relative accuracy and reproducibility of the measurements made with the Coulter Counter suggest that it is a valuable tool for obtaining quantitative particle size information on the rubber modified polystyrene syste