Sedimentation and light scattering studies of copolymer latexes

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Journal of Colloid and Interface Science


Our current understanding of the structure of carboxylic acid latexes is briefly reviewed. Earlier measurements of the dependence of particle diameter on pH by angular intensity light scattering (AILS) were in apparent disagreement with measurements by photon correlation spectroscopy (PCS). New measurements of the dependence of particle diameter on pH for a carboxylic acid latex and a comparable no-acid latex by AILS, PCS, and sedimentation are reported. The hydrodynamic methods (PCS and sedimentation) show a maximum in diameter with pH while the AILS results are independent of pH. The diameter of a no-acid latex was found to be independent of pH both by AILS and PCS.


Copyright © 1985 Published by Elsevier Inc.

This paper is dedicated to Dr. Milton Kerker on the occasion of his 65th birthday.

Supported by grants from the National Science Foundation, the Union Carbide Corporation and the Atlantic Research Corp.