Poly(acrylic acid), sodium salt (PAA-Na), also known as sodium polyacrylate, is a water-soluble anionic polymer with sodium carboxylate groups along the polymer backbone. This grade is a 20% aqueous solution with an approximate molecular weight of 225,000.
Synonyms: Sodium polyacrylate; poly(sodium prop-2-enoate); polyacrylic acid sodium salt.
The solution contains 19.0-21.0% w/w polymer solids and has a Brookfield viscosity of 400-1200 cPs at 25°C.
Molecular weight differentiates the sodium polyacrylate grades available from Polysciences. Lower-molecular-weight grades are used as pigment dispersants, while higher-molecular-weight grades are used as flocculants.
Key Properties
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Chemical type: Water-soluble anionic sodium polyacrylate
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CAS number: 9003-04-7
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Approximate molecular weight: ~225,000
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Concentration: 20% aqueous solution
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Solids content: 19.0-21.0% w/w
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Brookfield viscosity at 25°C: 400-1200 cPs
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Solubility: Water
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Storage temperature: Room temperature
Applications
Flocculation
Higher-molecular-weight sodium polyacrylate grades are used as flocculants. This grade has an approximate molecular weight of 225,000.
Laboratory Reagent Use
The defined molecular weight, aqueous concentration, and viscosity range make this grade suitable for laboratory work requiring water-soluble sodium polyacrylate.
Compatibility & Bonding Considerations
- Soluble in water
- 20% aqueous solution with 19.0-21.0% w/w polymer solids
- Stable under normal conditions of use and storage
This grade is supplied in water and does not require dissolution of a dry polymer before use.
Application Tips
- The 20% designation refers to the concentration of sodium polyacrylate in the aqueous solution; MW ~225,000 refers to the approximate molecular weight of the polymer
- Use 19.0-21.0% w/w solids when calculating polymer concentration from the solution
Handling & Storage
- Store at room temperature
- Use in a well-ventilated laboratory area
- Avoid contact with skin and eyes
- Wear appropriate protective gloves, protective clothing, and eye protection during handling
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FAQ
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1. Is PAA-Na the same as sodium polyacrylate?
Yes. PAA-Na is a common abbreviation for poly(acrylic acid), sodium salt, which is also known as sodium polyacrylate.
2. What does the 20% concentration mean?
The 20% designation refers to the concentration of sodium polyacrylate in water. The solids content is 19.0-21.0% w/w.
3. What does MW ~225,000 mean?
MW ~225,000 refers to the approximate molecular weight of the sodium polyacrylate polymer. It is separate from the 20% solution concentration.
4. Is poly(acrylic acid), sodium salt soluble in water?
Yes. This sodium polyacrylate grade is water-soluble and is supplied as an aqueous solution.
5. What is high-molecular-weight sodium polyacrylate used for?
Higher-molecular-weight sodium polyacrylate grades are used as flocculants, while lower-molecular-weight grades are used as pigment dispersants.
Safety & Documentation
This material causes skin and eye irritation. Use adequate ventilation and appropriate personal protective equipment during handling. Refer to the Safety Data Sheet (SDS) for complete handling, storage, first-aid, and safety information.
