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Polyvinyl Alcohol: Polyvinyl Acetate Stirred in Alcoholic Potash
Vinyl alcohol itself cannot be isolated, but its polymer can: Herrmann and Haehnel (patent 1928) stirred ground polyvinyl acetate into potash dissolved in alcohol, and polyvinyl alcohol fell out as a white, odourless powder that dissolves in water. It is the protective colloid in PVA (polyvinyl acetate) glue emulsions.
The picture: our diagram of the patent's Example I.
Intermediate
An hour, then drying
Instructions
1
1
Grind the polyvinyl acetate
Grind the polyvinyl acetate
Grind the solid polyvinyl acetate to a powder in a mortar (our method).
Materials for this step:
Polyvinyl Acetate80 gTools needed:
Mortar and Pestle
Digital Kitchen Scale2
2
Dissolve the potash
Dissolve the potash
Dissolve 60 g potassium hydroxide in 50 g ethyl alcohol in a vessel you can stir. Potash burns skin and eyes.
Materials for this step:
Potassium Hydroxide60 g
Ethanol - Lab Grade, 95%50 gTools needed:
Glass Beaker
Glass Stirring RodDigital Kitchen Scale
Chemical-Resistant Gloves
Chemical Splash Goggles3
3
Stir in the acetate
Stir in the acetate
Add the 80 g ground polyvinyl acetate while stirring hard, and keep stirring for about half an hour. Polyvinyl alcohol precipitates.
Tools needed:
Glass BeakerGlass Stirring RodChemical-Resistant GlovesChemical Splash Goggles4
4
Filter and dry
Filter and dry
Collect the precipitate on a filter and dry it: a white powder without odour that dissolves in water.
Tools needed:
Buchner Funnel (Porcelain)
Filter Paper
Open Drying TrayChemical-Resistant Gloves5
5
Scaling the patent's example
Scaling the patent's example
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Materials
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Tools Required
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