Acrylic monomers play a central role in the coatings, adhesives, and polymer industries. Two of the most widely used are Methacrylic Acid (MAA, CAS 79-41-4) and Acrylic Acid (AA, CAS 79-10-7). While they share similarities, their chemical structures and performance characteristics define distinct applications. For industrial buyers, understanding these differences is critical in making the right procurement decisions.
Chemical Structure and Properties
| Feature | Methacrylic Acid (MAA) | Acrylic Acid (AA) |
|---|---|---|
| CAS No. | 79-41-4 | 79-10-7 |
| Molecular Formula | C4H6O2 | C3H4O2 |
| Structure | 2-Methylpropenoic acid (contains an extra methyl group) | Propenoic acid |
| Appearance | Clear, colorless liquid with pungent odor | Clear, colorless liquid with acrid odor |
| Boiling Point | ~161 °C | ~141 °C |
| Stability | Higher UV and thermal stability | More reactive, less thermally stable |
Key Differences in Applications
Methacrylic Acid (MAA)
- Used in coatings, adhesives, plastics, insulation materials.
- Common in PMMA (polymethyl methacrylate) production, impact modifiers, and specialty resins.
Acrylic Acid (AA)
Widely used in superabsorbent polymers (SAP), paints, adhesives, textiles, water treatment.
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