Lena Savoie
Polyvinyl alcohol (PVA) is a water-soluble synthetic resin used in the treatment of textiles and paper. It is unique among polymers in that it is not built up in polymerization reactions from single-unit precursor molecules known as monomers. Instead, PVA is made by dissolving another polymer, polyvinyl acetate (PVAc), in an alcohol, such as methanol, and treating it with an alkaline catalyst, such as sodium hydroxide. PVA is used in a variety of applications, including drug manufacturing, food packaging, and textile production. Its adhesive properties and biocompatibility make it a versatile material in various industries.
| Characteristics | Values |
|---|---|
| Formula | [CH2CH(OH)]n |
| Type | Synthetic resin, polymer |
| State | Solid |
| Colour | Colourless (white) |
| Odour | Odourless |
| Texture | Flammable |
| Toxicity | Non-toxic, low acute oral toxicity |
| Biodegradability | Biodegradable |
| Solubility | Water-soluble |
| Reactivity | Reacts with formaldehyde and butyraldehyde |
| Applications | Drugs, adhesives, textiles, paper, coatings, 3D printing, food packaging, detergents |
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What You'll Learn
- Polyvinyl alcohol (PVA) is a water-soluble, synthetic resin
- PVA is made by dissolving polyvinyl acetate (PVAc) in an alcohol
- PVA has adhesive properties, used in glue and to fix porous materials
- PVA is used in many drugs, acetic acid, perfumes, dyes and flavouring agents
- PVA is non-toxic, biocompatible, and biodegradable
Polyvinyl alcohol (PVA) is a water-soluble, synthetic resin
PVA has adhesive properties, which make it highly useful. It is resistant to oil, grease, and solvents. It has high tensile strength and flexibility, as well as oxygen and aroma barrier properties. These properties are dependent on humidity. At higher humidity levels, water acts as a plasticiser, reducing tensile strength but increasing elongation and tear strength.
PVA is used in a variety of applications due to its biocompatibility, low protein adhesion, and low toxicity. It is used in papermaking, textile warp sizing, and as a thickener and emulsion stabilizer in PVAc adhesive formulations. It is also used in coatings, 3D printing, and medical applications such as vascular stents, cartilage replacements, and contact lenses. PVA is also used in the production of drugs, acetic acid, perfumes, dyes, and flavouring agents.
The safety of PVA has been observed through oral administration, with low acute oral toxicity, poor absorption in the gastrointestinal tract, and no accumulation in the body. However, PVA can cause mucous irritation and, in some cases, allergic reactions in the eyes and skin.
PVA is also used in packaging applications, providing an environmentally friendly and biodegradable alternative. It can be dissolved in water and used in laundry detergent pods and dishwasher sachets, reducing total packaging material use.
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PVA is made by dissolving polyvinyl acetate (PVAc) in an alcohol
Polyvinyl alcohol (PVA) is a water-soluble synthetic polymer. It is a man-made polymer composed of vinyl and alcohol groups. It is colourless (white) and odourless, with excellent film-forming, emulsifying, and adhesive properties. It is also resistant to oil, grease, and solvents.
PVA is unique among polymers as it is not built up from single-unit precursor molecules known as monomers. Instead, it is made by dissolving another polymer, polyvinyl acetate (PVAc), in an alcohol, such as methanol. PVAc is created by polymerizing vinyl acetate monomers. An alkaline catalyst, such as sodium hydroxide, is then used to treat the dissolved PVAc. The resulting hydrolysis or "alcoholysis" reaction removes the acetate groups from the PVAc molecules, leaving behind vinyl alcohol repeating units. The chemical structure of these units is [CH2CH(OH)]n. When the reaction is allowed to proceed to completion, the product is highly soluble in water and insoluble in organic solvents.
The properties of the resulting polymer are dependent on the degree of transesterification. The conversion of polyvinyl esters is usually conducted by base-catalysed transesterification with ethanol. The product is also affected by the length of the initial vinyl acetate polymer and the degree of hydrolysis under alkaline or acidic conditions.
PVA has a wide range of applications, including in the food and pharmaceutical industries, due to its non-toxic, biocompatible, and biodegradable nature, along with its excellent mechanical properties and film-forming plasticity. It is used in papermaking, textile warp sizing, coatings, and 3D printing. It is also used in the production of synthetic adhesives, which are used in various fields.
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PVA has adhesive properties, used in glue and to fix porous materials
Polyvinyl alcohol (PVA) is a water-soluble synthetic polymer. It is made up of vinyl and alcohol groups and is commonly supplied as beads or solutions in water. PVA has adhesive properties due to the presence of the alcohol group, which also makes it flammable. Its adhesive property is the main reason for its wide range of applications.
PVA is used to manufacture synthetic adhesives that are used in various fields. It is soluble in water and can be used as an emulsion. Its major function is to fix porous materials such as wood, paper, and cloth. It is also used as a consolidant for porous building materials like sandstone. PVA adhesive is flexible and delivers a strong bond. It is not acidic, which makes it useful for bookbinding and book arts.
PVA is also known as wood glue, carpenter's glue, or school glue. It is often used for modest woodworking projects as it is easy to apply and inexpensive. PVA glue can be used to secure or "paste" things like clothing, paper, and wood. It can also be used as a sealant for plaster and as a non-waterproof interior varnish.
PVA is a versatile adhesive that can be mixed with other substances to lengthen its drying time, making it ideal for bookbinding. It dries completely clear, but pre-coloured versions are also available. PVA is a low-cost, water-based, non-toxic adhesive that is safe to handle with bare hands.
PVA is prepared by polymerizing vinyl acetate monomers into polyvinyl acetate, followed by hydrolyzing the acetate moiety. It is a semi-crystalline polymer with a crystalline index that varies according to the synthesis process and physical aging. The degree of hydrolysis and molecular weight of PVA influence its solubility.
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PVA is used in many drugs, acetic acid, perfumes, dyes and flavouring agents
Polyvinyl alcohol (PVA) is a water-soluble synthetic polymer. It is used in the production of drugs, acetic acid, perfumes, dyes, flavouring agents, and more. PVA is used in a variety of medical applications because of its biocompatibility, low tendency for protein adhesion, and low toxicity. Its oral use is considered harmless as it is poorly absorbed from the gastrointestinal tract and does not accumulate in the body.
PVA is used in the production of drugs, such as drug-loaded tablets with modified drug-release characteristics where PVA is used as a binder substance. PVA-based microparticles have received FDA 510(k) approval to be used as embolisation particles for peripheral hypervascular tumours. It is also used in the production of oral dosage forms, which have great potential in the pharmaceutical industry.
PVA is used in the production of acetic acid. It is made by hydrolysing polyvinyl acetate or other vinyl ester-derived polymers with formate or chloroacetate groups instead of acetate. The conversion of polyvinyl esters is conducted by base-catalysed transesterification with ethanol.
PVA is used in the production of perfumes due to its excellent film-forming, emulsifying, and adhesive properties. It is also resistant to oil, grease, and solvents. PVA has high tensile strength and flexibility, as well as high oxygen and aroma barrier properties.
PVA is used in the production of dyes. It is used in the manufacturing of pigments and inks. It is also used in the production of coatings and as a thickener and emulsion stabilizer in polyvinyl acetate (PVAc) adhesive formulations.
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PVA is non-toxic, biocompatible, and biodegradable
Polyvinyl alcohol (PVA) is a water-soluble synthetic polymer. It is made up of vinyl and alcohol groups and has adhesive properties. PVA is commonly used in household sponges, as well as in medical applications, such as contact lenses, vascular stents, cartilage replacements, and drug delivery systems. It is also used in papermaking, textile warp sizing, and as a thickener and emulsion stabilizer in polyvinyl acetate (PVAc) adhesive formulations.
PVA is generally considered non-toxic, biocompatible, and biodegradable. Its acute oral toxicity is very low, and it is poorly absorbed from the gastrointestinal tract. Tests have shown that fish are not harmed even at high concentrations of PVA in water. However, PVA can cause mucous membrane irritation. While it is generally non-toxic, research is ongoing to determine whether prolonged exposure to PVA glue can have harmful effects.
The biodegradability of PVA is influenced by its molecular weight and water solubility. Aqueous solutions of PVA with high water solubility tend to degrade faster. However, not all PVA grades are readily biodegradable, and its slow degradation process has been noted as a potential environmental concern. PVA requires specific enzymes and microorganisms to fully biodegrade, which most wastewater treatment facilities are not equipped with. As a result, PVA has been detected in soil, waterways, breast milk, and fish.
To address these concerns, researchers are working on enhancing the physicochemical properties of PVA by incorporating natural polymers or nanomaterials. This could expand its applications in packaging materials and contribute to reducing plastic waste. For example, PVA is used in hospital laundry bags that dissolve in the washing machine cycle, reducing total packaging material use. Overall, PVA's biodegradability and versatility make it a valuable resource in various industries, including textiles, adhesives, and medicine.
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Frequently asked questions
The monomeric unit of polyvinyl alcohol (PVA) is vinyl alcohol.
Polyvinyl alcohol is made by polymerizing vinyl acetate monomers into polyvinyl acetate, followed by hydrolyzing the acetate moiety.
Polyvinyl alcohol is used in papermaking, textile warp sizing, as a thickener and emulsion stabilizer, in coatings, and in 3D printing. It is also used in the medical field due to its biocompatibility, low protein adhesion, and low toxicity.
Polyvinyl alcohol has excellent film-forming, emulsifying, and adhesive properties. It is resistant to oil, grease, and solvents, and has high tensile strength and flexibility. It is also odorless, colourless, and non-corrosive.
Polyvinyl alcohol is generally considered safe, with low acute oral toxicity. It is also non-toxic, biocompatible, and biodegradable. However, it can cause mucous irritation and may lead to allergic reactions in the eyes and skin.
