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Methacrylic acid

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 InfoCard100.001.096EC Number
  • 201-204-4
MeSHC008384
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 C4H6O2Molar mass86.09 g/mol Appearance Colorless liquid OdorAcrid, repulsive Density1.015 g/cm Melting point14 to 15 °C (57 to 59 °F; 287 to 288 K) Boiling point161 °C (322 °F; 434 K) 9% (25 °C) Vapor pressure0.7 mmHg (20 °C) Hazards GHS labelling: DangerH302, H312, H314P260, P264, P270, P280, P301+P317, P301+P330+P331, P302+P352, P302+P361+P354, P304+P340, P305+P354+P338, P316, P317, P321, P330, P362+P364, P363, P405, P501NFPA 704 (fire diamond)
3
2
2
Flash point77.2 °C (171.0 °F; 350.3 K) NIOSH (US health exposure limits):
PEL (Permissible)
none
REL (Recommended)
TWA 20 ppm (70 mg/m) [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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Methacrylic acid, abbreviated MAA, is an organic compound with the formula CH2=C(CH3)CO2H. 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).

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