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| Names | |
|---|---|
| IUPAC name Poly[1-(acetyloxy)ethylene] | |
| Other names PVAc, PVA, Poly(ethenyl ethanoate), Poly(ethenyl acetate) | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider |
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| ECHA InfoCard | 100.108.147 |
| KEGG |
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| UNII | |
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| Properties | |
| (C4H6O2)n | |
| Molar mass | 86.09 g/mol per unit |
| Density | 1.19 g/cm3 (25 °C) |
| Boiling point | 112 °C (234 °F; 385 K) |
| Hazards | |
| Safety data sheet (SDS) | MSDS |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Polyvinyl acetate (PVA,PVAc,poly(ethenyl ethanoate)), commonly known aswood glue (a term that may also refer toother types of glues),PVA glue,white glue,carpenter's glue,school glue, orElmer's Glue in the US, is a widely available adhesive used for porous materials like wood, paper, and cloth. Analiphaticrubberysynthetic polymer with the formula (C4H6O2)n, it belongs to thepolyvinyl ester family, with the general formula −[RCOOCHCH2]−. It is a type ofthermoplastic.[1]
Thedegree of polymerization of polyvinyl acetate is typically 100 to 5000, while itsester groups are sensitive tobase hydrolysis and slowly convert PVAc intopolyvinyl alcohol andacetic acid.
Theglass transition temperature of polyvinyl acetate is between 30 and 45 °C depending on the molecular weight.
PVAc dispersions such asElmer's Glue-All contain polyvinyl alcohol as aprotective colloid. In alkaline conditions,boron compounds such asboric acid orborax cause the polyvinyl alcohol tocross-link, forming tackifying precipitates or toys, such asSlime andFlubber.
A number of microorganisms can degrade polyvinyl acetate. Most commonly, damage is caused by filamentousfungi; however,algae,yeasts,lichens, andbacteria can also degrade polyvinyl acetate.[2]
Polyvinyl acetate was discovered inGermany in 1912 byFritz Klatte.[3]
The monomer,vinyl acetate, was first produced on an industrial scale by the addition ofacetic acid toacetylene in the presence of a mercury(I) salt acting as acatalyst,[4] but it is now primarily made bypalladium-catalyzed oxidative addition ofacetic acid toethylene.
PVA is avinyl polymer. Polyvinyl acetate is prepared by thepolymerization ofvinyl acetate monomer (free-radical vinyl polymerization of themonomer vinyl acetate).
As adispersion in water (usually an emulsion), PVAc preparations are used asadhesives forporous materials, particularly forwood,paper, andcloth, and as a consolidant for porous building stone, in particularsandstone.[5] PVAc is considered a food-safe material,[6] and is thus used often in such applications (e.g., in food packaging material).
Uses:
The stiffhomopolymer PVAc, but mostly the softercopolymer, a combination of vinyl acetate and ethylene,vinyl acetate ethylene (VAE), is also used inpaper coatings,paint and other industrial coatings, as a binder innonwovens inglass fibers,sanitary napkins,filter paper and intextile finishing.
Polyvinyl acetate is also the raw material to make other polymers like:
| Authority control databases: National |
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