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Polyvinyl alcohol ( CHINA PVA )

1. Polyvinyl alcohol PVA Performace

Polyvinyl alcohol (abbreviated as PVA) also can be called PVOH. It is a kind of heavy polymer, produced by polymerization and alcoholysis of vinyl acetate. PVA is white or light yellow floccus, granular or powdery in appearance. Its molecular formula is［CH2CHOH］n，and the molecular formula for some of the PVA is -［CH2CHOH］n-［CH2CHOOCCH3］m-. PVA is non-toxic, insipid and harmless. It is water-soluble and the solvent provide good viscosity and film building.

2.Polyvinyl alcohol features

Good thermal stability

No changes will take place below 140 ℃ till 160℃ it slowly turns yellow, intermolecular dehydration will take place between 170℃ to 200℃, intramolecular dehy-dration will take place above 200℃ , and will be discomposed completely above 300℃.

PVA is water soluble

PVA aqueous solution is very adhesive, especially for porous materials such as fiber, wood, paper and so on. Fully alcoholysis pva aqueous solution is easy to get at low temperature

PVA has the bio-degradation property

The degradation rate of pva with about 1700 polymerization degree is the highest.

3.Polyvinyl alcohol main use:

Some other uses of polyvinyl alcohol include:

1. Adhesive and thickener material in latex paints, paper coatings, hairsprays, shampoos and glues.

2. Textile agent

3. barrier in (PET) bottles.

4. for use as synthetic vessels in flow testing.

5. Movie and children's play or slime when combined with .

6. Feminine hygiene and adult incontinence products as a plastic backing sheet.

7. As a because materials such as do not stick to it.

8. As a water-soluble film useful for packaging.

9. As fiber reinforcement in concrete

10. As a surfactant for the formation of polymer encapsulated nanobeads

11. Used with polyvinyl acetate to make Elmer's glue

12. Used in eye drops and hard solution as a lubricant.

13. Used in protective chemical-resistant gloves

14. Used as a for specimen collection, especially stool samples

15. When doped with iodine, PVA can be used to polarize light.

16. As an agent in medical procedures

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