Dielectric Spectroscopy of Model Polymer Colloids

Fitch, Robert M.; Su, L.-S.; Tsaur, Sheng-Liang

doi:10.1007/978-94-009-1950-1_16

Cited by 3 publications

(1 citation statement)

References 15 publications

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“…It is perhaps surprising to find that the rubbery plateau modulus of Li + -neutralized samples was lower than that of the Na + -neutralized samples at the same pH value since the size of the Li + ion is expected to be smaller than the Na + ion. However, it has been noted that the size of hydrated Li + is larger than hydrated Na + ion . The latex samples were dried under mild conditions.…”

Section: Resultsmentioning

confidence: 99%

Effect of Ionomeric Behavior on the Viscoelastic Properties and Morphology of Carboxylated Latex Films

Kan

Blackson

1996

Macromolecules

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The viscoelastic properties of a series of carboxylated styrene/butadiene latexes were determined using dynamic mechanical spectroscopy. The viscoelastic properties of the latex films were found to depend on the pH of the latex and the type of neutralization ions present in the latex. This change in the viscoelastic properties is explained by the change in the ionomeric characteristics of the latex and a change of morphology of the latex film as determined using transmission electron microscopy. At low pH, the low-T g (glass-transition temperature) essentially noncarboxylated bulk polymer phase is often the continuous phase with the high-T g carboxylated interfacial polymer as the dispersed phase. As the mobility of the interfacial polymer decreases with increasing ionomeric characteristic with increasing pH, the morphology changes to one in which the high-T g carboxylated interfacial polymer is the continuous phase.

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Section: Resultsmentioning

confidence: 99%

Effect of Ionomeric Behavior on the Viscoelastic Properties and Morphology of Carboxylated Latex Films

Kan

Blackson

1996

Macromolecules

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Dielectric spectroscopic characterization of a weak‐acid polystyrene colloid

Jayasuriya

Fitch³

1993

Polymer International

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A commercially available aqueous polystyrene colloid with surface ‐COOH groups was purified by exhaustive dialysis. This was then investigated for dielectric frequency response in the low frequency domain (0.01‐100 Hz), as a function of pH, ionic strength and the chemical nature of the counterions in the electrical double layer. In previous work on strong‐acid (sulfonate) colloids it had been shown that a plot of the imaginary part of the complex impedance as a function of the real part gave semicircles whose radii were a direct function of the surface charge density. In this work, surface charge is a function of pH. The degree of counterion binding was a function of hydrated ion size, as determined from an analysis of titration data and ionic strength of the continuous phase, which in turn was determined from the phase angle and the characteristic relaxation frequency. Dielectric spectroscopy is thus a powerful non‐invasive tool for quantitative analysis of the properties of the electrical double layer in these systems.

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Fundamental studies on morphology control for latex systems with application to waterborne coatings: The effect of polymer radical mobility in latex particles during polymerization

Stubbs

Sundberg

2003

J. Coatings Tech.

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Dielectric Spectroscopy of Model Polymer Colloids

Cited by 3 publications

References 15 publications

Effect of Ionomeric Behavior on the Viscoelastic Properties and Morphology of Carboxylated Latex Films

Effect of Ionomeric Behavior on the Viscoelastic Properties and Morphology of Carboxylated Latex Films

Dielectric spectroscopic characterization of a weak‐acid polystyrene colloid

Fundamental studies on morphology control for latex systems with application to waterborne coatings: The effect of polymer radical mobility in latex particles during polymerization

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