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A New Methodology for Measuring the Stability of Emulsion Polymer Particles
Author(s) -
MéndezEcoscia Ana C.,
PratesPereira André F.,
FonsecaMarques Margarida B.,
SheibatOthman Nida,
McKenna Timothy F. L.
Publication year - 2016
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201500097
Subject(s) - coalescence (physics) , dynamic light scattering , electrolyte , colloid , coagulation , polymer , materials science , emulsion , volume fraction , light scattering , dlvo theory , chemical engineering , analytical chemistry (journal) , scattering , chromatography , chemistry , nanotechnology , optics , nanoparticle , physics , composite material , electrode , psychiatry , astrobiology , engineering , psychology
Summary A new methodology for the rapid and robust evaluation of the electrostatic stabilization of latex particles has been developed. It is based on the interpretation of the backscattering profile obtained using a Turbiscan Lab®. The experimental approach employs Multiple Light Scattering (MLS) in agitated measurement cells so the colloidal stability study can be performed at moderate concentration of latexes particles. Coalescence of the latex particles at different volume fraction was provoked by the addition of an aliquot of a concentrated solution of monovalent electrolyte (NaCl). The backscattering spectra were treated in order to follow the variation of the stability as a function of salt concentration, and from this variation to identify the critical coagulation concentration (CCC) of the system under investigation, in a rapid and robust manner.