Preparation and characterization of amphoteric polystyrene latices

Homola, A.; James, R.

doi:10.1016/0021-9797(77)90346-0

Cited by 146 publications

(74 citation statements)

References 24 publications

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“…Equations [6] have been widely used to interpret potentiometric data not only for a homogeneous polyelectrolyte solution (12, 13) but also for a heterogeneous colloidal particle solution (10,11) and for oxide surfaces (14). Application of this equation for our potentiometric titration data, therefore, seems to be a reasonable approach for describing dissociation behaviors of the grafted chain with charge groups.…”

Section: Resultsmentioning

confidence: 88%

“…[4] that pH should be regarded as the surface pH (pH s ), because all of the charge groups are located at the interface between the pore surface and the electrolyte solution; the solution pH is different from the surface pH due to the existence of the charge groups (10,11). The surface pH s is related to the solution pH by the Boltzmann equation as follows,…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Comparison of Surface and Net Charge Densities of Poly(acrylonitrile) Membranes Grafted with Ionic Monomers: Hydrophilic and Hydrophobic Effects of Graft Chain

Jimbo

Tanioka

Minoura

1998

Journal of Colloid and Interface Science

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Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Comparison of Surface and Net Charge Densities of Poly(acrylonitrile) Membranes Grafted with Ionic Monomers: Hydrophilic and Hydrophobic Effects of Graft Chain

Jimbo

Tanioka

Minoura

1998

Journal of Colloid and Interface Science

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“…However, a number of recent results on polymeasurements. The surface properties are compared with those of mer latexes (3)(4)(5)(6)(7)(8)(9) show that it is difficult to understand styrene-butadiene copolymer latex particles having both sulfate such observed phenomena as stability, electrophoresis, and and carboxyl groups. The differences in the overall dimensions of flocculation with such a model.…”

mentioning

confidence: 98%

Surface Characteristics of Polystyrene Latex Particles and Comparison with Styrene–Butadiene Copolymer Latex Particles Using Dynamic Light Scattering and Electrophoretic Light Scattering Measurements

Zhao

Brown

1996

Journal of Colloid and Interface Science

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“…Estos corresponderían a la valoración de grupos funcionales superficiales de naturaleza ácido débil. La no perfecta linealidad pone en evidencia la presencia de grupos polinucleares y poliméricos de naturaleza ácido débil 14 . Los responsables del incremento de la conductividad, en el ultimo tramo lineal, son los iones OH -en exceso que se adicionan a la disolución.…”

Section: Curvas De Valoración Conductimétricaunclassified

Naturaleza y formación de los complejos intermedios del sistema SnCl2 - NH4OH - H2O

2001

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Current technological advances require that the raw materials used in the production of electric devices and structural materials present special characteristics of chemical purity, size distribution and morphology of the particles. Tin oxides are mainly used as gas sensor and as surges suppressor (varistor). To achieve an appropriate control on the mentioned characteristics, we use the method of controlled precipitation (MPC), which allowed us to obtain certain characteristics in other oxides. When using the MPC, it is necessary to determine the complexes that are formed and their nature. In this work we present results of study on the formation of complexes in the system SnCl2 -NH4OH -H2O. To study the system during the constant addition of the base (NH4OH) to the solution of tin salt, we used potentiometric and conductimetric titration. For the determination of the nature of the formed tin complexes, the solid phase was characterized using X-ray diffraction (XRD) while the liquid phase was analyzed by UV-visible and infrared spectroscopies. Keywords: tin oxide, synthesis, controlled precipitation, intermediate complexes IntroducciónLas propiedades que presenta un material dependen del tamaño y morfología de las partículas de la materia prima con la que fue fabricado y por tanto de la micro-estructura que se genera durante su procesamiento. Esta condición se puede justificar a través de una simple consideración 1 . La energía total de un sistema, ETot, es principalmente la suma de dos contribuciones: la energía interna, Ei y la energía superficial, Es; tal que:Siendo ei la energía por unidad de volumen y g la energía interfacial por unidad de superficie. V y A representan el volumen y superficie total, respectivamente, del polvo cerámico disperso. La contribución de cada término contenido en la Ec. 1 varia de un sistema a otro dependiendo de las condiciones de trabajo. La relación entre estos tér-minos depende de lo que se denomina factor geométrico. Reorganizando la Ec. 1 se obtiene:Pero ya que ei y g son propiedades características de cada material, la variable que determina el valor de la energía total del sistema por unidad de volumen es la razón (A/V), denominada razón de aspecto. Si esta razón es grande, el segundo término es muy importante y las propiedades del material, tanto durante su procesamiento y conformado como en sus propiedades finales, están fuertemente afectadas por la contribución de la energía superficial a la energía total del sistema. Altos valores de la razón de aspecto se pueden obtener si una, dos o tres de las dimensiones del sistema son pequeñas, lo cual se logra en películas, fibras y partículas pequeñas. Para el presente trabajo la ultima presentación, partículas dispersas, es la que presenta interés.La variación de la razón de aspecto de los polvos cerámicos se puede realizar utilizando molienda seca o húmeda pero la efectividad del proceso depende del tipo de Molino, que se utilice y es inevitable una contaminación superficial y/o volumétrica de la muestra 2 . Es por eso que se ...

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Preparation and characterization of amphoteric polystyrene latices

Cited by 146 publications

References 24 publications

Comparison of Surface and Net Charge Densities of Poly(acrylonitrile) Membranes Grafted with Ionic Monomers: Hydrophilic and Hydrophobic Effects of Graft Chain

Comparison of Surface and Net Charge Densities of Poly(acrylonitrile) Membranes Grafted with Ionic Monomers: Hydrophilic and Hydrophobic Effects of Graft Chain

Surface Characteristics of Polystyrene Latex Particles and Comparison with Styrene–Butadiene Copolymer Latex Particles Using Dynamic Light Scattering and Electrophoretic Light Scattering Measurements

Naturaleza y formación de los complejos intermedios del sistema SnCl2 - NH4OH - H2O

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