methyl methacrylate

n. The methyl ester of methacrylic acid, C₅ H₈O₂, a colorless flammable liquid used as a monomer in plastics.

methyl methacrylate

n (Elements & Compounds) a colourless liquid compound, used in the manufacture of certain methacrylate resins. Formula: CH2C(CH3)COOCH3

meth′yl methac′rylate

n. a colorless, volatile, flammable liquid, C₅H₈O₂, an unsaturated ester of methacrylic acid that polymerizes readily to a clear plastic. [1930–35]

Methyl Methacrylate

methyl methacrylate

[¦meth·əl mə′thak·rə‚lāt] (organic chemistry) CH₂C(CH₃)COOCH₃ A flammable, colorless liquid, soluble in most organic solvents but insoluble in water; used as a monomer for polymethacrylate resins.

Methyl Methacrylate

a methyl ester of methacrylic acid, CH₂ = C(CH₃) — COOCH₃; a colorless liquid. Boiling point, 101°C; density, 0.936 g/cm3 at 20°C; solubility in water at 30°C, 1.5 percent (by weight). Freely soluble in alcohol and ethyl ether.

Methyl methacrylate hydrolyzes to form methacrylic acid, and upon heating with alcohols (with strong acids serving as catalysts), ester interchange takes place. This process is used in industry to manufacture several other methacrylic acid esters— for example, butyl methacrylate. Methyl methacrylate combines with chlorine, hydrogen, hydrogen bromide, amines, ammonia, mercaptans, amides, aliphatic nitro compounds, and hydrocyanic acid along its double bond. It polymerizes readily, yielding polymethyl methacrylate. Stabilizers (0.005–0.5 percent), such as hydroquinone and copper, are added to methyl methacrylate to prevent polymerization during storage.

Methyl methacrylate is usually prepared industrially from acetone and hydrocyanic acid, via acetone cyanohydrin, (CH₃)₂C(OH)—CN. It has a systemic, narcotic effect, and its vapors irritate the mucous membranes; the maximum permissible level in air is 0.05 mg per liter. Methyl methacrylate is mainly used in the manufacture of Plexiglas.

REFERENCES

Vaculik, P. Khimiia monomerov, vol. 1. Moscow, 1960. (Translated from Czech.)
Sorenson, W., and T. Campbell. Preparativnye melody khimiipolimerov. Moscow, 1963. (Translated from English.)

methyl methacrylate

A tough, rigid, transparent acrylic plastic having good resistance to common solvents and acids; subject to crazing.

methyl methacrylate

meth·yl meth·ac·ry·late

a thermoplastic material used for denture bases and as an embedding material for electron microscopy.

polymethyl methacrylate (PMMA)

Polymerized methyl methacrylate forming a light transparent thermoplastic material used in the manufacture of some spectacle lenses and formerly hard contact lenses. See modulus of elasticity; plastic spectacle frame.

meth·yl meth·ac·ry·late

(methil methă-krilāt) Thermoplastic material used for denture bases and as an embedding material for electron microscopy.

单词	methyl methacrylate
释义	methyl methacrylate methyl methacrylate n. The methyl ester of methacrylic acid, C₅ H₈O₂, a colorless flammable liquid used as a monomer in plastics. methyl methacrylate n (Elements & Compounds) a colourless liquid compound, used in the manufacture of certain methacrylate resins. Formula: CH2C(CH3)COOCH3 meth′yl methac′rylate n. a colorless, volatile, flammable liquid, C₅H₈O₂, an unsaturated ester of methacrylic acid that polymerizes readily to a clear plastic. [1930–35] Methyl Methacrylate methyl methacrylate [¦meth·əl mə′thak·rə‚lāt] (organic chemistry) CH₂C(CH₃)COOCH₃ A flammable, colorless liquid, soluble in most organic solvents but insoluble in water; used as a monomer for polymethacrylate resins. Methyl Methacrylate a methyl ester of methacrylic acid, CH₂ = C(CH₃) — COOCH₃; a colorless liquid. Boiling point, 101°C; density, 0.936 g/cm3 at 20°C; solubility in water at 30°C, 1.5 percent (by weight). Freely soluble in alcohol and ethyl ether. Methyl methacrylate hydrolyzes to form methacrylic acid, and upon heating with alcohols (with strong acids serving as catalysts), ester interchange takes place. This process is used in industry to manufacture several other methacrylic acid esters— for example, butyl methacrylate. Methyl methacrylate combines with chlorine, hydrogen, hydrogen bromide, amines, ammonia, mercaptans, amides, aliphatic nitro compounds, and hydrocyanic acid along its double bond. It polymerizes readily, yielding polymethyl methacrylate. Stabilizers (0.005–0.5 percent), such as hydroquinone and copper, are added to methyl methacrylate to prevent polymerization during storage. Methyl methacrylate is usually prepared industrially from acetone and hydrocyanic acid, via acetone cyanohydrin, (CH₃)₂C(OH)—CN. It has a systemic, narcotic effect, and its vapors irritate the mucous membranes; the maximum permissible level in air is 0.05 mg per liter. Methyl methacrylate is mainly used in the manufacture of Plexiglas. REFERENCES Vaculik, P. Khimiia monomerov, vol. 1. Moscow, 1960. (Translated from Czech.) Sorenson, W., and T. Campbell. Preparativnye melody khimiipolimerov. Moscow, 1963. (Translated from English.) methyl methacrylate A tough, rigid, transparent acrylic plastic having good resistance to common solvents and acids; subject to crazing. methyl methacrylate meth·yl meth·ac·ry·late a thermoplastic material used for denture bases and as an embedding material for electron microscopy. polymethyl methacrylate (PMMA) Polymerized methyl methacrylate forming a light transparent thermoplastic material used in the manufacture of some spectacle lenses and formerly hard contact lenses. See modulus of elasticity; plastic spectacle frame. meth·yl meth·ac·ry·late (methil methă-krilāt) Thermoplastic material used for denture bases and as an embedding material for electron microscopy. AcronymsSeeMMAThesaurusSeepolymethyl methacrylate
随便看	austrian thermal power austrian ticacat fancy austrian traded index austrian trade union federation austrian traffic telematics cluster austrian triad austrian universities continuing education network bacterioid bacterioidal bacterioidally bacterioidly bacteriol. bacteriologic bacteriological bacteriological ammunition bacteriological analytical manual bacteriologic algorithm bacteriologically bacteriologically acidified feta-type bacteriological reconnaissance bacteriological specimen bacteriological standard of meat bacteriological war bacteriological warfare bacteriological weapon