Polyvinyl alcohol (PVOH, PVA, or PVAl) is a water - soluble synthetic polymer. It has the idealized formula [CH 2 CH (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.

Polyvinyl alcohol is a water-soluble synthetic polymer obtained by polymerization of vinyl alcohol. It has varying roles in commercial and industrial applications such as papermaking, textiles, and printing. Polyvinyl alcohol is found in ophthalmic solutions as a lubricant to prevent irritation or to relieve dryness of the eyes.

2024年12月7日 · polyvinyl alcohol (PVA), a colourless, water-soluble synthetic resin employed principally in the treating of textiles and paper. PVA is unique among polymers (chemical compounds made up of large, multiple-unit molecules) in that it is not built up in polymerization reactions from single-unit precursor molecules known as monomers.

Poly-vinyl alcohol (PVA) are synthesized in the presence of vinyl alcohol and acetate, and these monomers were responsible for the biocompatible, biodegradable, bioinert, and semicrystalline nature. Similar to PEG, PVA is also a water-soluble polymer and used in SLS printing technique.

Polyvinyl alcohol (synonyms, vinyl alcohol polymer, PVA, ethenol homopolymer) is a water-soluble synthetic resin, prepared by the polymerization of vinyl acetate, followed by partial or complete catalysed hydrolysis. The primary raw material used in the manufacture of polyvinyl alcohol is vinyl acetate monomer dissolved in methanol.

Polyvinyl alcohol has a melting point of 180 to 190°C. It has a molecular weight of between 26,300 and 30,000, and a degree of hydrolysis of 86.5 to 89%. The primary raw material used in the manufacture of polyvinyl alcohol is vinyl acetate monomer. It is manufactured by the polymerization of vinyl acetate followed by partial hydrolysis.

2014年1月1日 · Poly (vinyl alcohol) is a synthetic polymer bearing repeating −CH 2 −CH (OH)− units, which is generally prepared from post-polymerization reaction of a homopolymer obtained from a protected monomer, such as vinyl acetate.

Polyvinyl alcohol also known as PVA, PVOH, or PVAI, water soluble synthetic polymers, made from polyvinyl acetate. Most of the polymers are manufactured by polymerization of its monomeric unit. However, in case of PVA preparation, polymerization of vinyl alcohol not possible as monomer is unstable because of tautomerism to stable acetaldehyde.

Polyvinyl Alcohol (PVA) is unique among polymers in a way that, it is not built up in polymerization reactions from single-unit precursor monomers. Instead, PVA is made by from another poly- mer [16].

Unlike most vinyl polymers, PVA is not prepared by polymerization of the corresponding monomer. The monomer, vinyl alcohol, almost exclusively exists as the tautomeric form, acetaldehyde. PVA instead is prepared by partial or complete hydrolysis of polyvinyl acetate to remove acetate groups.