Methacrylic acid

Methacrylic acid, abbreviated MAA, is an organic compound with the formula CH2=C(CH3)COOH. This colorless, viscous liquid is a carboxylic acid with an acrid unpleasant odor. It is soluble in warm water and miscible with most organic solvents. Methacrylic acid is produced industrially on a large scale as a precursor to its esters, especially methyl methacrylate (MMA), and to poly(methyl methacrylate) (PMMA).

Methacrylic acid
Names
IUPAC name
Methacrylic acid
Preferred IUPAC name
2-Methylprop-2-enoic acid
Other names
Methacrylic acid
2-Methyl-2-propenoic acid
α-Methacrylic acid
2-Methylacrylic acid
2-Methylpropenoic acid
Identifiers
3D model (JSmol)
Abbreviations MAA
ChEBI
ChemSpider
ECHA InfoCard 100.001.096
EC Number
  • 201-204-4
MeSH C008384
UNII
  • InChI=1S/C4H6O2/c1-3(2)4(5)6/h1H2,2H3,(H,5,6)
    Key: CERQOIWHTDAKMF-UHFFFAOYSA-N
  • CC(C(O)=O)=C
Properties
C4H6O2
Molar mass 86.09 g/mol
Appearance Colorless liquid
Odor Acrid, repulsive
Density 1.015 g/cm3
Melting point 14 to 15 °C (57 to 59 °F; 287 to 288 K)
Boiling point 161 °C (322 °F; 434 K)
9% (25 °C)
Vapor pressure 0.7 mmHg (20 °C)
Hazards
NFPA 704 (fire diamond)
3
2
2
Flash point 77.2 °C (171.0 °F; 350.3 K)
NIOSH (US health exposure limits):
PEL (Permissible)
 none
REL (Recommended)
 TWA 20 ppm (70 mg/m3) [skin]
IDLH (Immediate danger)
 N.D.
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
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