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主图.jpg "China Manufacturer Supply High Quality Poly(vinyl alcohol) CAS 9002-89-5 wholesale")
Here's a concise explanation of Poly(vinyl alcohol) (PVA or PVOH) under 100 words:
Poly(vinyl alcohol) is a water-soluble synthetic polymer made by hydrolyzing poly(vinyl acetate) (replacing acetate groups with hydroxyl groups, -OH). It's not made directly from vinyl alcohol, which is unstable.
Key Properties:
Highly water-soluble (degree depends on hydrolysis level).
Excellent film-forming ability, adhesion, and strength when dry.
Biodegradable and generally non-toxic.
Primary Uses:
Water-soluble packaging (e.g., laundry detergent pods).
Adhesives (paper, wood, textiles).
Paper coatings & textile sizing.
Thickeners in paints/cosmetics.
Biomedical applications (contact lenses, drug delivery).
Its solubility and film properties make it uniquely versatile.
Poly(vinyl alcohol) (PVA or PVOH) is a water-soluble synthetic polymer with unique properties. Here's a concise overview:
Chemical Structure:
Made of repeating units of vinyl alcohol (−CH₂−CHOH−). However, it is not made directly from vinyl alcohol (which is unstable), but by hydrolyzing poly(vinyl acetate) (PVAc).
Key Properties:
Highly hydrophilic & water-soluble (degree depends on hydrolysis level).
Excellent film-forming ability.
Good adhesive properties.
High tensile strength & flexibility when dry.
Biodegradable (under certain conditions) and non-toxic.
Resistant to oils, greases, and many organic solvents.
Primary Uses:
Adhesives & Binders: Paper, textiles, wood glue.
Films & Packaging: Water-soluble films (e.g., detergent pods, agricultural chemicals).
Textiles: Warp sizing agent.
Paper Coatings: Improves strength and ink receptivity.
Emulsifier & Thickener: Paints, cosmetics.
Biomedical: Contact lenses, drug delivery systems, artificial tears.
Construction: Cement/plaster additive for workability and strength.
Degree of Hydrolysis (DH):
PVA's properties (esp. solubility) are controlled by its DH – the percentage of acetate groups replaced by hydroxyl groups (-OH):
Partially Hydrolyzed (DH ~87-89%): Soluble in cold water.
Fully Hydrolyzed (DH ~98-99%): Soluble only in hot water.
In short: PVA is a versatile, non-toxic, water-soluble polymer made from hydrolyzed poly(vinyl acetate). Its solubility, film strength, and adhesion make it essential in adhesives, packaging, textiles, paper, and biomedicine.
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