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.

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(2009) showed that only capsules coated with A-type methacrylic acid copolymer complied with the requirements of disintegration tests.
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pH-sensitive hydrogel drug delivery system was synthesized with the help of poly hydroxyethyl methacrylate (HEMA) and methacrylic acid (MAA) by using ethylene glycol dimethacrylate (EGDMA) as crosslinker.
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The project aims at developing a renewable value chain to methacrylic acid, a key constituent of acrylic paints.
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Also, anionic fluorinated polymers containing methacrylic acid (MAA) residues in the ammonium carboxylate form adhered more strongly compared to corresponding acidic polymer counterparts.
Comparative examination of adhesive and cohesive properties of fluorinated coatings on stone/tile surfaces
Melanie Jury, site director for Lucite International at Cassel, said: "The calibre of the ex-military personnel we've taken on so far has been excellent and I'm sure Matthew and Sean will be no different and will be welcomed by our team alongside the other apprentices." Southampton-headquartered Lucite International employs around 300 people on Teesside and manufactures a total of around 250,000 tonnes a year of two 'building block' products used in the manufacture ethyl and t its ingobal of acrylics - me methacrylate (MMA) methacrylic acid (MAA) at 69-acre Cassel Site at Billiham, Lucite's largest gloproduction site for MMA mufacture.
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Modified cocoa pod husk filled polypropylene composites by using methacrylic acid. Bioresources, 8: 3260-3275.
Effect of electron beam irradiation on the tensile properties of chitosan/corn cob biocomposite films
Methacrylic acid (MAA) contains methyl, and benzoic acid (BA) contains benzene ring.
Influence of different carboxylic acid ligands on luminescent properties of Eu[(Lc).sub.3]phen (Lc = MAA, AA, BA, SA) complexes
Anionic copolymer composed of methylacrylate, methyl-methacrylate and methacrylic acid have dissolution properties in slightly neutral environment (pH = 6.8).
Levan in the developing of new colon-specific polymer material: evaluation of the permeability, moisture and thermal analyses in free films of Eudragit[R] FS 30 D/Levana no desenvolvimento de novo material polimerico colon-especifico: avaliacao da permeabilidade, intumescimento e analises termicas de filmes isolados de Eudragit[R] FS 30 D

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