Properties of aqueous solutions and gels of poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide)-g-poly(acrylic acid)

Article Abstract:

Research was conducted to examine the properties of aqueous solutions and gels of poly(ethylene oxide)-b-poly(propylene oxide) (PPO)-b-poly(ethylene oxide)-g-poly(acrylic acid) using differential scanning calorimetry and rheological techniques. The objective is to gain an insight into the structure of the novel copolymers in aqueous solutions and mechanisms of their temperature-induced micellization. The weak dependence of the polymer concentration at the maximum reduced viscosity on the salt concentration is caused by hydrophobic interactions between PPO segments.

Micelles, Polyethylene, Hydrogen-ion concentration, Gelation

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Studies of transport phenomena and electrostatic interactions in polyacrylate gels

Article Abstract:

The transport of ions and molecules in polyacrylate hydrogels was investigated using steady-state voltammetry with microelectrodes. For low concentrations of polyacrylate, the diffusion of small uncharged molecules were found to be mainly influenced by the composition of the solution immobilized in the gel. The transport properties of ions in the gels were found to be strongly dependent on the charge density of the polymer. .

Colloids, Transport theory, Acrylates

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Electrodynamic investigations of ion transport and structural properties in drug-containing gels: Dielectric spectroscopy and transient current measurements on catanionic carbopol systems

Article Abstract:

The potential of using electrodynamic methods as characterization tools in controlled drug release process, on complex drug release systems is shown. The two formulations used were a Carbopol gel containing diphenhydramine and an identical gel also containing the surfactant sodium dodecyl sulfate, which forms catanionic vesicles with the diphenhydramine.

Usage, Electrodynamics, Chemical properties, Gels (Pharmacy)

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