Methyl Methacrylate

(redirected from Methacrylates)
Also found in: Dictionary, Medical.
Related to Methacrylates: methacrylate ester

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.
References in periodicals archive ?
The Methacrylates business has 15 production sites and 3,900 employees worldwide.
The transaction comprises the Methacrylates, Acrylic Products and CyPlus business lines, and some of the methacrylate resins activities.
The transaction includes the Methacrylates, Acrylic Products and CyPlus business lines, and some of the methacrylate resins activities.
Silorane composite overall showed better shear bond strength and can be used with Methacrylate based composites in repair options using silane coupling agent and its silorane adhesive bond.
Whether in durable coatings and adhesives or in ultra-transparent plastic, methacrylate monomers are part of many everyday products and applications.
Bis-acrylics:2 Bis-acrylic composite provisional materials addressed many of the drawbacks of methacrylates. These materials are similar to the composite materials used in direct restorations, and can be repaired using composites.
In recent years, many studies have been carried on aromatic acrylate and methacrylate monomers and polymers [1-4].
Based on the results of DSC, it is possible to explain the extraordinary properties of copolymers of n-alkyl methacrylates (PAMA) as the pour point depressants of mineral lubricating oil (see Fig.
Acrylates and methacrylates act via clastogenic mechanisms to cause genotoxicity, and methacrylates require a higher dose to cause damage than do acrylates.
The North American Standard Series (Chemotechnique screening series) has been found to identify many cases of acrylate allergy caused by the inclusion of methyl methacrylate and ethyl acrylate in the series.
The General Court of the EU has reduced the fine levied by the European Commission against three companies in a cartel case in the methacrylates sector (Case T-208/06).
The business subject to the deal includes a manufacturing site in England producing hydroxy methacrylates, multifunctional methacrylates (MFM) and specialty adducts, polyalkylene glycols (PAG) and PAG-based lubricants, the buyer said in a press release.