Polyvinyl alcohol
Chemical compound / From Wikipedia, the free encyclopedia
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Polyvinyl alcohol (PVOH, PVA, or PVAl) is a water-soluble synthetic polymer. It has the idealized formula [CH2CH(OH)]n. It is used in papermaking, textile warp sizing, as a thickener and emulsion stabilizer in polyvinyl acetate (PVAc) adhesive formulations, in a variety of coatings, and 3D printing. It is colourless (white) and odorless. It is commonly supplied as beads or as solutions in water.[3][4] Without an externally added crosslinking agent, PVA solution can be gelled through repeated freezing-thawing, yielding highly strong, ultrapure, biocompatible hydrogels which have been used for a variety of applications such as vascular stents, cartilages, contact lenses, etc.[5]
Names | |
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Other names
PVOH; Poly(Ethenol), Ethenol, homopolymer; PVA; Polyviol; Vinol; Alvyl; Alcotex; Covol; Gelvatol; Lemol; Mowiol; Mowiflex, Alcotex, Elvanol, Gelvatol, Lemol, Nelfilcon A, Polyviol und Rhodoviol | |
Identifiers | |
ChEMBL | |
ChemSpider |
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ECHA InfoCard | 100.121.648 |
E number | E1203 (additional chemicals) |
KEGG |
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RTECS number |
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UNII | |
CompTox Dashboard (EPA) |
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Properties | |
(C2H4O)x | |
Density | 1.19–1.31 g/cm3 |
Melting point | 200 °C (392 °F; 473 K) |
log P | 0.26 [1] |
Refractive index (nD) |
1.477 @ 632 nm[2] |
Hazards | |
NFPA 704 (fire diamond) | |
Flash point | 79.44 °C (174.99 °F; 352.59 K) |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
14,700 mg/kg (mouse) |
Safety data sheet (SDS) | External MSDS |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Although polyvinyl alcohol is often referred to by the acronym PVA, more generally PVA refers to polyvinyl acetate, which is commonly used as a wood adhesive and sealer.