Polyvinyl alcohol is one of the few synthetic water-soluble high molecular polymers. Its indexes mainly include the degree of polymerization, the degree of alcoholysis and other special performance indicators. The main production process of PVA is: vinyl acetate is polymerized to form polyvinyl acetate, and then subjected to alcoholysis to form polyvinyl alcohol.
The PVA aqueous solution is easy to form a film, and the formed film is colorless and transparent, has good mechanical strength, and the surface is smooth and not sticky. The film is permeable to water vapor, but the permeability of gases such as hydrogen, oxygen, and carbon dioxide is very low, and the change in external temperature has little effect on the film.
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