Polyvinyl alcohol (PVA or PVOH) is a synthetic polymer that is widely used in a variety of industrial and consumer applications due to its unique combination of properties. It is a water-soluble, biodegradable polymer made by the hydrolysis of polyvinyl acetate. Unlike many other polymers, PVA is not prepared by polymerizing vinyl alcohol, because vinyl alcohol is unstable. Instead, it is manufactured by the polymerization of vinyl acetate, which is then hydrolyzed to produce .One of the most important characteristics of PVA is its water solubility, which can be adjusted by controlling the degree of hydrolysis and polymerization. The higher the hydrolysis, the less soluble it becomes. This property makes PVA useful in applications where the polymer must dissolve or disperse in water without leaving harmful residues. It is also known for its excellent film-forming, adhesive, and emulsifying properties, as well as chemical resistance, non-toxicity, and biodegradability.

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