Methacrylic Acid


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methacrylic acid

[¦meth·ə¦kril·ik ′as·əd]
(organic chemistry)
CH2C(CH3)COOH Easily polymerized, colorless liquid melting at 15-16°C; soluble in water and most organic solvents; used to make water-soluble polymers and as a chemical intermediate.

Methacrylic Acid

 

α-methyl-acrylic acid, CH2=C(CH3)—COOH; a colorless liquid with a sharp odor. Melting point, 16°C; boiling point, 160.5°C; density, 1.0153 g/cm3 (at 20 °C). Soluble in water and organic solvents.

Methacrylic acid is reduced to isobutyric acid by sodium amalgam; it reacts with bases and alcohols to form methacrylates, CH2=C(CH3)COOR, which may be salts (if R is a metal) or esters (if R is an organic radical). It polymerizes readily, yielding polymethacrylic acid, which is colorless, brittle, infusible, and highly hygroscopic and is a typical weak polyelectrolyte.

Methacrylic acid is prepared commercially by the addition of hydrocyanic acid, HCN, to acetone, with subsequent dehydration to methacrylonitrile, CH2=C(CH3)—CN, which then undergoes saponification. Methacrylic acid and its derivatives are used in the manufacture of important industrial polymeric products. Methyl methacrylate, which is used in the preparation of Plexiglas, is the most valuable methacrylic acid derivative. Methacrylic acid is also used in the manufacture of carboxylated rubber, safety glass, adhesives, and ion-exchange resins; polymethacrylic acid salts serve as emulsifiers.

References in periodicals archive ?
Methacrylic acid salts of other metal centers did not produce significant activation, consistent with previous work investigating alternative metal oxide/stearic acid complexes.
Functional acid monomers, such as acrylic acid (AA), methacrylic acid (MAA), itaconic acid (IA), and vinylphosphonic acid (VPA), were incorporated for enhancing latex stability and paint compatibility (especially with the target component in this study: Ti[O.
It has recently been discovered that certain peroxide coagents based on zinc salts of acrylic and methacrylic acid provide improvements in applications where heat resistance is required under dynamic strains (refs.
This HPLC method uses cation-exchange and reversed-phase chromatography on a solid phase of methacrylic acid and methacrylate ester.
Methacrylic Acid and Its Salts: European Union Market Outlook 2010 and Forecast till 2015
In commercially available ethylene and methacrylic acid based random copolymers, 1580% of the acid groups are neutralized by suitable alkali to form metal salts.
The company manufactures 250,000 tonnes a year of two 'building block' products used in the manufacture of acrylics - methyl methacrylate (MMA) and methacrylic acid (MAA).
Modified cocoa pod husk-filled polypropylene composites by using methacrylic acid.
Acrylic monomers comprise the monomeric alkyl esters of acrylic acid and methacrylic acid, and their derivatives.
An important advantage of the new process is the capability to produce methyl methacrylate and methacrylic acid simultaneously in a single plant.
Furthermore, with a goal to achieve improved hydrophilicity and mechanical properties we have attempted to modify the virgin silk fibers by grafting poly methacrylic acid.
Abstract The potentiometric titration of carboxylated methyl methacrylate latexes prepared with varying amounts of methacrylic acid showed that only very small amounts of their total acids copolymerized were neutralized at room temperature until the acid level was well above 10%.