Publication

Charge density, solvent polarity and counterion nature effects on the solution properties of some polycations

Jutta Christine Wandrey
2004
Journal Articles

Abstract

The electrolytic cond. and soln. viscosity of some strong polycations, which possess the ammonium quaternary centers either attached to an acrylic macromol. chain (polycation PDMAEMQ type), or in the backbone (polycation PCA type), have been measured to identify how charge d., polyelectrolyte concn., solvent polarity as well as counterion nature influence the ultimate soln. properties. The investigations reveal for all polycations an increase of the equiv. cond. with decreasing concn. The onset of the strong increase shifts to lower concn. if the charge d. augments. Polyelectrolyte behavior was obsd. for PCA5D1 in the mixt. of water/methanol for all solvent compns. employed and in the mixt. of water/acetone up to 60 vol. % of acetone content. At all exptl. concns. the reduced viscosity decreases with the dielec. const. of the mixed solvent. Furthermore, the specific interaction between several mono- and divalent counterions with some of these polycations was clearly proved by conductometric measurements. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/60721d81-ec5d-4b26-bd26-ca5a1761cc54

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Jutta Christine Wandrey
2004
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/60721d81-ec5d-4b26-bd26-ca5a1761cc54

About this result

Related concepts (32)

Solvent

A solvent (from the Latin solvō, "loosen, untie, solve") is a substance that dissolves a solute, resulting in a solution. A solvent is usually a liquid but can also be a solid, a gas, or a supercritical fluid. Water is a solvent for polar molecules and the most common solvent used by living things; all the ions and proteins in a cell are dissolved in water within the cell. Major uses of solvents are in paints, paint removers, inks, and dry cleaning. Specific uses for organic solvents are in dry cleaning (e.

Acetone

Acetone (2-propanone or dimethyl ketone), is an organic compound with the formula . It is the simplest and smallest ketone (). It is a colorless, highly volatile and flammable liquid with a characteristic pungent odor. Acetone is miscible with water and serves as an important organic solvent in industry, home, and laboratory. About 6.7 million tonnes were produced worldwide in 2010, mainly for use as a solvent and for production of methyl methacrylate and bisphenol A, which are precursors to widely-used plastics.

Viscosity

The viscosity of a fluid is a measure of its resistance to deformation at a given rate. For liquids, it corresponds to the informal concept of "thickness": for example, syrup has a higher viscosity than water. Viscosity is defined scientifically as a force multiplied by a time divided by an area. Thus its SI units are newton-seconds per square metre, or pascal-seconds. Viscosity quantifies the internal frictional force between adjacent layers of fluid that are in relative motion.