a polymer prepared from polyvinyl acetates by replacement of the acetate groups with hydroxyl groups. it is used as a pharmaceutic aid and ophthalmic lubricant as well as in the manufacture of surface coatings artificial sponges, cosmetics, and other products. Diluent in colour additive mixtures for marking food PVA is an atactic material but exhibits crystallinity as the hydroxyl groups are small enough to fit into the lattice without disrupting it.; Polyvinyl alcohol (PVOH, PVA, or PVAL) is a water-soluble synthetic polymer (not to be confused with polyvinyl acetate, a popular wood glue).; Polyvinyl alcohol has excellent film forming, emulsifying, and adhesive properties. It is also resistant to oil, grease and solvent. It is odorless and nontoxic. It has high tensile strength and flexibility, as well as high oxygen and aroma barrier properties. However these properties are dependent on humidity, in other words, with higher humidity more water is absorbed. The water, which acts as a plasticiser, will then reduce its tensile strength, but increase its elongation and tear strength. PVA is fully degradable and is a quick dissolver. PVA has a melting point of 230░C and 180?190░C for the fully hydrolysed and partially hydrolysed grades, respectively. It decomposes rapidly above 200░C as it can undergo pyrolysis at high temperatures.
Category: coatings, binding agents, sealing agents and surface-finishing agents
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