Effects of concentration relative permittivity and temperature on the solution behavior of sodium carboxymethylcellulose as probed by electrical conductivity

Article Abstract:

Experimental results for the equivalent conductivity of a salt-free solution of a polyelectrolyte sodium salt of carboxymethylcellulose (NaCMC) in acetonitrile /water mixed-solvent media are presented as a function of the polymer concentration and temperature. The equivalent conductivities increase with increasing temperature over the entire concentration range in a given mixed solvent medium but the values decrease as the relative permittivity of the medium decreases.

Science & research, Research, Electric properties, Electrical conductivity, Solvents

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pH Dependence of the interaction between rhodamine B and the water-soluble poly(sodium 4-styrenesulfonate)

Article Abstract:

The binding of rhodamine B (RB) to the polyanion containing aromatic groups poly(sodium 4-styrenesulfonate) (PSS) was studied by separation and spectroscopic techniques at pH between 2 and 7. At pH below 5 significant binding was found together with a red-shift of the RB maximum of absorbance to 564nm and RB fluorescence quenching and the basicity of RB increased by the influence of the polymer.

Polymers, Styrene, Atomic properties

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Location of phenothiazine in sodium dodecyl sulfate/n-pentanol/water microemulsions

Article Abstract:

The location of phenothiazine (PTZ) in sodium dodecyl sulfate (SDS)/n-pentanol (n-C5H11OH)/water microemulosions is studied by cyclic voltammetry at a Pt electrode. The results indicate that PTZ exists in the membrane phase of microemulsion droplets with its N atom or S atom toward the polar head of the surfactant.

Analysis, Voltammetry, Phenothiazine, Phenothiazines

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