Cationic latex formation by ionic modification

Schumacher, Heloisa Cajon; Alves, Marilene; Leite, Carlos A. P.; Santos, Juliane Pereira; Neto, Érico Teixeira; Murakami, M; Galembeck, Fernando; Amaral, Marcelo do

doi:10.1016/j.jcis.2006.09.057

Cited by 15 publications

(8 citation statements)

References 31 publications

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“…This situation has been changing. Interests in cationic polymer latexes have been in constant increase for the last decade, both fundamental and applied research are being reported 2–12. In a study on self‐assembly of cationic and anionic latex particles through heterocoagulation,13 preparation of cationic latexes was attempted with different cationic functional monomers including dodecyl benzyl dimethyl ammonium chloride, cetyl trimethyl ammonium bromide (CTAB) and methacryloxyethylhexadecyldimethyl ammonium bromide (DMHB), results revealed that only the latter two cationic monomers, that is, CTAB and DMHB, led to stable latexes with easily adjustable particle size.…”

Section: Introductionmentioning

confidence: 99%

Preparation of cationic functional polymer latexes and measurement of involatile monomer conversion

Yang

Zhu

Kong

2011

J of Applied Polymer Sci

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A series of poly(styrene-co-methacryloxyethylhexadecyldimethyl ammonium bromide), P(St-DMHB), cationic particles were prepared by emulsion polymerization using 2,2 0 -azobis(2-methylpropionamide) dihydrochloride as the initiator with different levels of DMHB as the cationic functional comonomer. f potential, particle size, and size distribution of the particles were determined. Large discrepancy was observed between the particle size from dynamic light scattering and that from transmission electron microscopy. Results showed that particle size and f potentials were closely dependant on DMHB level used. A flocculation process for the cationic latex was established, and a method to estimate DMHB conversion was proposed.

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Section: Introductionmentioning

confidence: 99%

Preparation of cationic functional polymer latexes and measurement of involatile monomer conversion

Yang

Zhu

Kong

2011

J of Applied Polymer Sci

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“…A range of spherical radii particles of a ∈ (50, 155) nm, a range of ionic strengths of I ∈ (0.01, 0.1) M, which yields a value of κa > 15, and a range of charge density of σ ∈ −(0.1, 1.3) C m −2 , were used. In all of these cases, the maximum relative error obtained using the planar geometry expression (5) instead of the second-order approximated spherical expression (6), is less than 2% (results not shown). These results justify the use of planar instead of spherical geometry for latex particles under the experimental conditions given above.…”

Section: Theoretical Backgroundmentioning

confidence: 95%

“…1 Functionalized latex particles are frequently used as an experimental model of charged particles. [2][3][4][5][6][7][8] These particles have acid-base ionizable groups, which are responsible for the surface charge due to their dissociation and subsequent release of counterions in solution. The properties of this kind of materials are strongly influenced by the electrostatic effects that take place at the interface.…”

Section: Introductionmentioning

confidence: 99%

A semi-grand canonical Monte Carlo simulation model for ion binding to ionizable surfaces: Proton binding of carboxylated latex particles as a case study

Madurga

Rey-Castro²,

Pastor³

et al. 2011

The Journal of Chemical Physics

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In this paper, we present a computer simulation study of the ion binding process at an ionizable surface using a semi-grand canonical Monte Carlo method that models the surface as a discrete distribution of charged and neutral functional groups in equilibrium with explicit ions modelled in the context of the primitive model. The parameters of the simulation model were tuned and checked by comparison with experimental titrations of carboxylated latex particles in the presence of different ionic strengths of monovalent ions. The titration of these particles was analysed by calculating the degree of dissociation of the latex functional groups vs. pH curves at different background salt concentrations. As the charge of the titrated surface changes during the simulation, a procedure to keep the electroneutrality of the system is required. Here, two approaches are used with the choice depending on the ion selected to maintain electroneutrality: counterion or coion procedures. We compare and discuss the difference between the procedures. The simulations also provided a microscopic description of the electrostatic double layer (EDL) structure as a function of pH and ionic strength. The results allow us to quantify the effect of the size of the background salt ions and of the surface functional groups on the degree of dissociation. The non-homogeneous structure of the EDL was revealed by plotting the counterion density profiles around charged and neutral surface functional groups.

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“…Usually, the emulsions, especially the emulsions made with vinyl acetate monomers, had a much lower cost and good adhesive . With its peculiar performance, the emulsions became the all‐important choice for desertification and soil salinization control.…”

Section: Introductionmentioning

confidence: 99%

An amphoteric poly(VAc‐DBM‐AM‐DMAPS) emulsion focusing on the ecological sand‐fixing in salty desert: Structure and properties

Gong

Zang

et al. 2016

J of Applied Polymer Sci

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In order to control the impacts of blown sand in salty desert, in this article, the amphoteric emulsion, for the first time, was applied as an ecological sand-fixing material. This study started from the synthesis of the poly{vinyl acetate-dibutyl maleate-acryl-Then, the structures, composition, thermal property of the emulsion were characterized by 1 H-NMR, FTIR, and DSC, respectively.The basic properties of the emulsion and salt tolerance of the latex films were measured by using viscometer, dynamic light scattering, and laser Doppler electrophoresis also. And the sand-fixing properties of the emulsion were evaluated. Finally, the influence of the emulsion on the growth of soil microbe and plants were discussed for understanding its ecological effect. The experimental results showed that the emulsion has been successfully synthesized and could be as an ecological sand-fixing material. The related reason is that, first, the emulsion could significantly improve the compressive strength and water retaining; second, the emulsion had good thermal aging, freeze-thaw stabilities and salt tolerance to withstand the changes in temperature and NaCl concentration of salty desert; third, the influence of the emulsion on the growth of plants and microbe of sand also showed a dependable ecological effect.

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Cationic latex formation by ionic modification

Cited by 15 publications

References 31 publications

Preparation of cationic functional polymer latexes and measurement of involatile monomer conversion

Preparation of cationic functional polymer latexes and measurement of involatile monomer conversion

A semi-grand canonical Monte Carlo simulation model for ion binding to ionizable surfaces: Proton binding of carboxylated latex particles as a case study

An amphoteric poly(VAc‐DBM‐AM‐DMAPS) emulsion focusing on the ecological sand‐fixing in salty desert: Structure and properties

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