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PVA

All of Category:Polyvinyl alcohol Browse quantity:256 Compile time:2021-06-18
詳情
PVA: Organic compound, white flaky, flocculent or powdery solid, odorless. Soluble in water, insoluble in gasoline, kerosene, vegetable oil, benzene, toluene, dichloroethane, carbon tetrachloride, acetone, ethyl acetate, methanol, ethylene glycol, etc. Slightly soluble in dimethyl sulfoxide. Polyvinyl alcohol is an important chemical raw material, used in the manufacture of polyvinyl acetal, gasoline resistant pipe and vinylon synthetic fiber, fabric treatment agent, emulsifier, paper coating, adhesives, glue, etc.


It has the following excellent properties:
Solubility PVA is soluble in water, the higher the water temperature, the greater the solubility, but almost insoluble in organic solvents. The solubility of PVA varies with degree of alcoholysis and degree of polymerization. Partial alcoholysis and low degree of polymerization of PVA dissolved very quickly, while full alcoholysis and high degree of polymerization of PVA dissolved slowly. As a general rule, the effect on the solubility of PVA, alcoholysis degree is greater than the degree of polymerization. The dissolution process of PVA is carried out in stages: affinity wetting, swelling, infinite swelling and dissolution.



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