2-Acrylamido-2-methylpropane Sulfonic Acid, This white crystalline powder or granular solid features a strong sulfonic acid group (-SO₃H) combined with a polymerizable acrylamido functionality, enabling it to impart exceptional ionic character, hydrophilicity, and stability to polymers across a wide pH range.

AMPS is widely recognized for enhancing polymer performance in demanding applications where conventional monomers fall short, particularly in high-salinity, high-temperature, or aggressive chemical environments.

Key Physical and Chemical Properties

  • Appearance: White to off-white crystalline powder or granules
  • Purity (typical): ≥98.0% (HPLC), often ≥99.0%
  • Acid Number: 265–280 mg KOH/g
  • Melting Point: ≈184–195°C (decomposes)
  • Density: ≈1.1–1.45 g/cm³
  • Solubility: Highly soluble in water (>500 g/L), forms acidic aqueous solutions; insoluble in acetone
  • Flash Point: ≈160°C
  • Storage: Store in a cool, dry place below +30°C, protected from moisture and light

2-Acrylamido-2-methylpropane Sulfonic Acid Primary Applications

AMPS monomer is copolymerized into anionic, cationic, and amphoteric polymers to deliver superior properties such as:

  • Water Treatment: Scale inhibition, dispersancy, flocculation, and sludge dewatering in cooling towers, boilers, reverse osmosis systems, and wastewater processes
  • Oil & Gas / Enhanced Oil Recovery (EOR): High-temperature/high-salinity stable polymers for drilling fluids, fracturing fluids, and mobility control agents
  • Personal Care & Cosmetics: Hydrophilic modifiers in thickeners, superabsorbent gels, and conditioning polymers
  • Textiles & Acrylic Fibers: Improved dye receptivity, moisture absorbency, antistatic performance, and wash fastness in acrylic, modacrylic, and other synthetic fibers
  • Coatings, Adhesives & Emulsions: Enhanced adhesion, rheology control, pigment dispersion, and stability in emulsion paints, pressure-sensitive adhesives, and construction chemicals
  • Hydrogels & Biomedical: Superabsorbent polymers for wound dressings, drug delivery systems, and hygiene products
  • Paper & Textiles Additives: Retention aids, dry/wet strength improvers, and sizing agents

The sulfonic acid group provides excellent thermal, hydrolytic, and salt tolerance, making AMPS-based polymers ideal for harsh industrial conditions.

Why Choose High-Purity AMPS?

Premium-grade AMPS (≥99% purity, low iron ≤10 ppm, low water content) ensures consistent polymerization, reduced by-products, and optimal end-product performance in high-value formulations.

Frequently Asked Questions (FAQs)

What is the main advantage of AMPS over other sulfonic acid monomers?

AMPS combines excellent copolymerizability (via the acrylamido double bond) with strong ionic character from the sulfonic group, delivering better hydrolytic stability and performance in high-salinity or high-temperature environments compared to vinyl sulfonic acid or styrene sulfonate.

Is AMPS suitable for both aqueous and emulsion polymerization?

Yes. Its high water solubility makes it ideal for solution and inverse emulsion polymerization, while the reactive double bond allows incorporation into a wide range of polymer systems.

How does AMPS improve scale inhibition in water treatment?

The pendant sulfonate groups disrupt crystal growth of common scales (calcium carbonate, barium sulfate, etc.), while the polymer backbone provides dispersion and threshold inhibition.

Can AMPS be used in personal care products?

Yes, AMPS-based polymers are widely used in thickeners, gels, and conditioning agents due to their biocompatibility, clarity, and salt tolerance.

What storage conditions are recommended for AMPS?

Keep in sealed original packaging in a cool (<30°C), dry, dark place to prevent moisture absorption and premature polymerization.

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