Abstract
A series of monodisperse PMMA latexes was synthesized and characterized with respect to refractive index, percent solids, and solution density. The particle size of each latex was analyzed by Disc Centrifuge Photosedimentometry (DCP), Sedimentation Field Flow Fractionation (SFFF), Hydrodynamic Chromatography (HDC), Quasielastic Light Scattering (QELS), Transmission Electron Microscopy (TEM), and turbidity. A comparison of the apparent particle size averages of the latexes as measured by each method showed that for small, more monodisperse latexes the various methods agree more closely than for larger diameter samples having higher polydispersities. The relative ordering of the apparent sizes by method is consistent. The light scattering methods gave higher apparent particle sizes, TEM the lowest number, while DCP and SFFF were in relatively good agreement in the center of the range. This is explained in terms of the assumptions made and the physical parameters measured by each method.
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