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Coalescence of latex particles

Bradford and Vanderhoff (20) have also prepared films from crosslinked latex particles. These authors studied a 65 35 styrene-butadiene copolymer crosslinked with varying amounts of divinylbenzene and found that although the incorporation of divinylbenzene retarded the coalescence of latex particles, these particles did indeed coalesce, presumably due to a similar interdiffusion of polymer chain ends. [Pg.206]

Latex or emulsion paints Decoration of plaster or masonry surfaces Various coalescing solvents e.g. BEE BEEAc Hexylene glycol Water Dries by evaporation or migration of water followed by coalescence of latex particles. This may be assisted by addition of small quantities of high boiling coalescing solvents ... [Pg.52]

Latex la- teks [NS latic. latex, from L. fluid] (1835) (pi lattices or latexes) n. (1) An emulsion of a polymeric substance in an aqueous medium. (2) The sap of the hevea (rubber) tree and other plants, or emulsions prepared from the same. Latices of interest to the coatings and plastics industry are based mainly on styrene-butadiene co-polymers, polystyrene, acrylics, and vinyl polymers and co-polymers. (3) Fine dispersion of rubber or resin, natural or synthetic, in water the synthetic is made by emulsion polymerization. Latex and emulsion are often used synonymously in the paint industry. Emulsified monomers once polymerized become solids or plasticized gel particles and not emulsions but aqueous suspensions. Lovell PA, El-Aasser MS (eds) (1997) Emulsion polymerization and emulsion polymers. John Wiley and Sons, New York. Martens CR (1964) Emulsion and water-soluble paints and coatings. Reinhold Publishing Co., New York. VanderhofF JW, Gurnee EE (1956) Motion picture investigation of polymer latex phenomena. TAPPI 39 (2) 71-77. VanderhofF JW, Tarkowski HL, Jenkins MC, Bradford EG (1966) Theoretical considerations of the interfacial forces involved in the coalescence of latex particles. J Macromol Chem 1 (2) 361-397. [Pg.566]

Vanderhoff JW, Tarkowski FIL, Jenkins MC, Bradford EG (1966) Theoretical considerations of the interfacial forces involved in the coalescence of latex particles. J Macromol Chem l(2) 361-397 Vigo TL (1994) Textile processing, dyeing, finishing and performance. Elsevier Science, New York Vincenti R (ed) (1994) Elsevier s textile dictionary. [Pg.1237]

Applications. The spreading of fungicides on leaves, and aerosols in general after spraying spreading and coalescence of latex particles in paints and coatings (a latex is a polymer grain). [Pg.24]

Modification of mortar and concrete in the presence of a latex occurs by concurrent cement hydration and formation of a polymer film (coalescence of polymer particles and the polymerization of monomers). Cement... [Pg.350]

Although emulsion polymerization has been carried out for at least 50 years and has enormous economic importance, the detailed quantitative behavior of these reactors is still not well understood. For example, there are many more mechanisms and phenomena reported experimentally than have been incorporated in the existing theories. Considerations such as non-micellar particle formation, non-uniform particle morphologies, polymer chain end stabilization of latex particles, particle coalescence, etc. have been discussed qualitatively, but not quantitatively included in existing reactor models. [Pg.359]

Reactions based on interactions between hydrophilic polymers and hydro-- phobic colloids are common in nature and in industry. In biological systems, many reactions and processes have been interpreted in terms of polymer-colloid interactions (I, 2, 3). In various branches of industry, hydrophilic polymers are used as stabilizers or destabilizers (4, 5, 6). Especially in latex technology, hydrophilic polymers are used as agglomeration activators (7, 8). In this case, agglomeration means aggregation and coalescence of small particles into larger ones, as required for fluidity at high latex concentrations. [Pg.114]

Although polymers and monomers in any form such as latexes, water-soluble polymers, liquid resins, and monomers are used in cement composites such as mortar and concrete, it is very important that both cement hydration and polymer phase formation (coalescence of polymer particles and the polymerization of monomers) proceed well to yidd a monolithic matrix phase widi a network structure in which the hydrated cement phase and polymer phase interpenetrate. In the polymer-modified mortar and concrete structures, aggregates are bound by such a co-matrbc phase, resulting in the superior properties of polymer-modified mortar and conoete compared to conventional. [Pg.11]

Figure 4.9 Effect of varying the phase ratio on the tuimber of latex particles formed with a constant emulsifier concentration in the emulsion polymerization of styrene at 50 °C [99]. At a phase ratio greater than monomer water 1 25 coalescence of primary particles is reduced increasing the number of ultimate particles formed. Reproduced by permission of the American Chemical Society... Figure 4.9 Effect of varying the phase ratio on the tuimber of latex particles formed with a constant emulsifier concentration in the emulsion polymerization of styrene at 50 °C [99]. At a phase ratio greater than monomer water 1 25 coalescence of primary particles is reduced increasing the number of ultimate particles formed. Reproduced by permission of the American Chemical Society...
SANS along with other techniques like AFM allows the monitoring of latex particle coalescence and polymer chain inter-diffusion in greater and greater detail. Such fundamental understanding of film formation allows modification to polymerization reactions/ coating recipes and methods of film formation and the development of better quality films. ... [Pg.667]


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