Electron Microscopy of Synthetic Latices

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Abstract
A study has been made by electron microscopy of the size and size distribution of 22 synthetic latices. Included are GR‐S latices Types II, III, and V, polystyrene latices, and several latices of special character. Details are given on sample preparation, measurement, application of corrections, calculation of number, volume to surface, and molecular weight average diameters, as well as the number and weight average distributions. The weight average particle size range covered was 730 to 3920A. The smallest sizes were shown by Type II latices, followed in order by Type III, polystyrene, Type V, and some of the special latices. The latices were all nonhomogeneous in size and showed size distributions both on a number and weight basis which in some instances contained single and in some cases double maxima.