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À propos de : Protection of Colloidal Suspensions with RandomPoly(vinyl acetate) Copolymers        

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  • Protection of Colloidal Suspensions with RandomPoly(vinyl acetate) Copolymers
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  • We present experimental and self-consistent field (SCF) modeling results on partially hydrolyzed poly(vinyl acetate) (PVA) chains adsorbed on poly(vinyl chloride) (PVC) latex particles to determine therelationship between the structure of PVA and the steric force between the colloidal particles with adsorbedPVA. By measuring the surface pressure−area isotherms for a PVA-coated PVC latex monolayer at theair/water interface with the Langmuir−Blodgett surface balance, we found that both an increase in chainlength and a decrease in degree of hydrolysis increase the repulsive energy between colloidal particles.Surface pressure−area isotherms also reveal that temperatures ranging from 20 to 50 °C have little effecton the repulsive energy between the colloidal particles. We also used this method to analyze the effect ofPVA mixtures on colloidal stability. SCF modeling was used to analyze our experimental results. Ourresults showed excellent agreement between the SCF modeling results and the experimental results.
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