Thickening effect of dispersions of ethyl acrylate-methacrylic acid copolymer prepared by different polymerization routes

Bradna, Pavel; Štern, P.; Quadrat, O.; Šňupárek, Jaromı́r

doi:10.1007/bf00652345

Cited by 42 publications

(29 citation statements)

References 11 publications

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“…Solve the linear Eq. [7], and find the maximum value of f ij ⅐ n ij . If this value is larger than f c , remove the pair i Ϫ j from the contact table and go to Step 2.…”

Section: Simulationmentioning

confidence: 99%

“…The time evolution of the configuration of the particles is then simulated by solving Eq. [7] and determined by the following procedure.…”

Section: Simulationmentioning

confidence: 99%

“…The rheology of the dispersion of polystyrene particles, which are surrounded by a surfactant, is dominated by interactive forces due to the presence of the stabilizer barrier, rather than by the Brownian motion of the particles (6). The latex particle size shows a weak effect on the viscosity only at weight fractions lower than 5%, but a strong effect above 5% (7). A network model of an aggregating colloid as a system of overlapping colloidal aggregates linked by rigid and soft chains has been proposed (3).…”

Section: Introductionmentioning

confidence: 97%

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Microstructure and Viscosity of Aggregating Colloids under Strong Shearing Force

Chen

Doi

1999

Journal of Colloid and Interface Science

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“…Solve the linear Eq. [7], and find the maximum value of f ij ⅐ n ij . If this value is larger than f c , remove the pair i Ϫ j from the contact table and go to Step 2.…”

Section: Simulationmentioning

confidence: 99%

“…The time evolution of the configuration of the particles is then simulated by solving Eq. [7] and determined by the following procedure.…”

Section: Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

Microstructure and Viscosity of Aggregating Colloids under Strong Shearing Force

Chen

Doi

1999

Journal of Colloid and Interface Science

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“…Microgels provide rheological control for high solids formulations employed in the surface coatings industry (13). The influence of added non-absorbing polymer on the swelling of microgel particles is of practical interest in this field and constitutes a major application of this type of studies (14).…”

Section: Osmotic De-swellingmentioning

confidence: 99%

Microgeles: Un Nuevo Material Coloidal

Fernandez-Nieves¹,

Fernández-Barbero²,

Nieves³

2000

Bol. Soc. Esp. Ceram. Vidr.

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Microgels are novel colloidal gels widely used because of the swelling or de-swelling exhibited under specific external conditions. In this work, the swelling and de-swelling of microgel particles is experimentally described. The medium pH, salt concentration and osmotic stress, are the three variables with which the change of phase has been realised. All transitions are found to occur well above the critical point of the system. Additionally, the basic applications in which the given transition is employed are described. Keywords: Microgel, swelling, flory theory Microgeles: Un Nuevo Material ColoidalLos microgeles son geles coloidales que se emplean por el inflado y/o desinflado que manifiestan ante ciertas condiciones externas. En este trabajo, se describe experimentalmente el inflado y el desinflado de partículas de gel. El pH del medio, su concentración iónica y el esfuerzo osmótico externo son las variables externas que se emplean para provocar el cambio de fase en las partículas. Todas las transiciones ocurren por encima del punto crítico del sistema. Adicionalmente, se presentan algunas de las aplicaciones en donde se emplea la transición provocada por la variable externa concreta. THEORETICAL DESCRIPTION OF THE VOLUME PHASE TRANSITIONThe total osmotic equilibrium inside an ionic gel consists, basically of three contributions: mixing (π m ), elastic (π e ) and ionic (π i ) (1,2). Explicitly:where N A is the Avogadro number, N C the number of chains, k the Boltzmann constant, T the absolute temperature, ν s the molar volume of the solvent, V o and φ o the volume and polymer volume fraction of the gel in the totally collapsed state, χ the Flory interaction parameter, φ the polymer volume fraction for a given state and f the number of counterions per chain inside the gel.

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“…1 These unique strengths enable them to be used to variety of applications such as surface coatings, printing and pharmaceutical industries, bio-medical devices, supporting phases for separation science, sensors, controlled release reservoirs and supports for metallic nano-colloids. [2][3][4][5][6] In order to be applicable in the above area, the size control and narrow size distribution are the major concern. 7 Various techniques including emulsion, dispersion and suspension polymerization were proposed to prepare the crosslinked submicron and micron-sized spherical particles.…”

Section: Introductionmentioning

confidence: 99%

Effect of co-initiator on the size distribution of the stable poly(styrene-co-divinylbenzene) microspheres in acetone/water mixture

Choi

Lee

et al. 2009

Macromol. Res.

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Stable poly(styrene-co-divinylbenzene) [P(St-co-DVB)] microspheres with narrow size distribution were synthesized in the presence of 2,2'-azobis(2,4-dimethyl valeronitrile) (V-65) and co-initiator in an acetone/water mixture in the precipitation polymerization at 53 o C for 24 h. Potassium peroxodisulfate (KPS), ammonium peroxodisulfate (APS) and sodium peroxodisulfate (NaPS) were used as co-initiators. The optimum ratio of acetone to water for the formation of a narrow distribution of P(St-co-DVB) particles was 49:11 (g/g). The optimum co-initiator compositions for narrow distribution were 9:1 (g/g) for V-65 to KPS, 11:1 for V-65 to APS and 6:1 for V-65 to NaPS. The yield for these compositions was 54~57% and the largest particle size was obtained with the lowest zeta-potential and CV values. From the XPS measurements, the charge density was increased but the zeta potential decreased with increasing sulfur content, implying that the sulfate group provides the electrostatic stabilization on the particle surface. This suggested that the self-crosslinking between styrene and DVB, the electrostatic stabilization of initiators, and the balanced hydrophobic and hydrophilic properties of the solvents are responsible for the formation of stable P(St-co-DVB) spherical particles with narrow size distribution.

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Thickening effect of dispersions of ethyl acrylate-methacrylic acid copolymer prepared by different polymerization routes

Cited by 42 publications

References 11 publications

Microstructure and Viscosity of Aggregating Colloids under Strong Shearing Force

Microstructure and Viscosity of Aggregating Colloids under Strong Shearing Force

Microgeles: Un Nuevo Material Coloidal

Effect of co-initiator on the size distribution of the stable poly(styrene-co-divinylbenzene) microspheres in acetone/water mixture

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