Polymer solution

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A polymer solution contains, in addition to a solvent , dissolved polymers . A very frequently used model to describe polymer solutions is the Flory-Huggins model .

Properties and classification

A polymer solution can be recognized by the fact that it is a clear solution, since molecularly distributed polymers are not large enough to refract light. The model of the Hansen solubility parameters offers a possibility to calculate or predict the solubility of polymers.

Aqueous polymer solutions

Aqueous polymer solutions are polymers that are completely soluble in water. This should be distinguished from aqueous polymer dispersions which are compatible with water but which form a second, clearly defined phase. Examples of completely soluble in water are polyvinyl alcohol , methyl cellulose , polyethylene glycol and hydroxyethyl cellulose .

Solvent-based polymer solutions

Non-polar solvents such as xylene or acetone dissolve a large number of known polymers. Sufficient compatibility of polymer and solvent is necessary, which means that not every polymer can be dissolved by every solvent. It can only thermoplastic polymers are dissolved, elastomers and thermosets are maximum Swellable .

Applications

Aqueous polymer solutions

Paste uses the solubility of methyl cellulose in water. As the solvent (water) evaporates, the paste sets physically, which means that wallpaper adheres firmly to the wall.

Solvent-based polymer solutions

Solvent-based polymer solutions are used in many technical products. In the case of solvent-based paints , the binders are in the form of polymer solutions. Solvent-based adhesives are also polymer solutions. Plastisols , which are similar to polymer dispersions, must be distinguished from solvent-based polymer solutions .

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