Polymer latex stability modification by exposure to hydrophobic solvents

dc.creatorCardoso, AD
dc.creatorGalembeck, F
dc.date1998
dc.dateAUG 1
dc.date2014-12-02T16:30:21Z
dc.date2015-11-26T17:39:43Z
dc.date2014-12-02T16:30:21Z
dc.date2015-11-26T17:39:43Z
dc.date.accessioned2018-03-29T00:21:17Z
dc.date.available2018-03-29T00:21:17Z
dc.identifierJournal Of Colloid And Interface Science. Academic Press Inc, v. 204, n. 1, n. 16, n. 23, 1998.
dc.identifier0021-9797
dc.identifierWOS:000075262900003
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/70696
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/70696
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/70696
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1286515
dc.descriptionThe stability of latex particles toward coagulation in the presence of salt is modified by swelling the latex with toluene and chloroform vapors. Short-term stability was determined by turbidimetric titrations, and the long-term stability was evaluated by adding latex and salt solutions, allowing the mixture to age for 24 or 48 h and determining the characteristics of the supernatant and of the sediment. Nine different latexes were examined, with variable results: in some cases, both apolar solvents stabilize the latex; in other cases, increased stability is induced by only one of the solvents, either toluene or chloroform. There is also coherence, but not a strict correlation, between the solvent effects on short- and long-term stability. For instance, in the case of a core-and-shell styrene-butyl methacrylate latex, chloroform has a small stabilizing effect in the titration experiment, but it prevents the formation of a coagulated latex sediment even 48 h after mixing latex and salt. Two hypotheses are discussed to account for these observations: (i) swelling solvents decrease the particles ability to dissipate the collision kinetic energy, so that particles collide but without joining each other; (ii) the solvents induce the release of trapped charged groups from the particle interior to the interface, enhancing the usual (electrostatic, steric, hydration) stability factors. (C) 1998 Academic Press.
dc.description204
dc.description1
dc.description16
dc.description23
dc.languageen
dc.publisherAcademic Press Inc
dc.publisherSan Diego
dc.publisherEUA
dc.relationJournal Of Colloid And Interface Science
dc.relationJ. Colloid Interface Sci.
dc.rightsfechado
dc.sourceWeb of Science
dc.subjectcolloidal stability
dc.subjectparticle swelling
dc.subjectlatex stabilization by solvents
dc.subjectswelling and colloidal stability
dc.subjecthydrophobic solvent
dc.subjecteffect on colloidal stability
dc.subjectPolystyrene Latex
dc.subjectParticles
dc.subjectLattices
dc.subjectSurface
dc.subjectFlocculation
dc.titlePolymer latex stability modification by exposure to hydrophobic solvents
dc.typeArtículos de revistas


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