A method for the detection of traces of acrylonitrile

Štěpánek, J. M.; Černá, Věra

doi:10.1039/an9588300345

Cited by 3 publications

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Acrylonitrile and Acrylonitrile Polymers

Wu¹

2001

Encyclopedia of Polymer Science and Technology

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Acrylonitrile is a versatile and reactive monomer that can be polymerized under a wide variety of conditions and copolymerized with an extensive range of other vinyl monomers because of its polar nature and reactivity. Because of the difficulty of melt processing the acrylonitrile homopolymer, acrylonitrile is usually copolymerized to achieve a desirable thermal stability, melt flow, and physical properties. Acrylonitrile‐containing polymers are used in the areas of textile fibers, carbon fiber percursors, adhesives, binders, antioxidants, medicines, dyes, electrical insulations, emulsifying agents, graphic arts materials, insecticides, leather, paper, plasticizers, soil‐modifying agents, solvents, surface coatings, textile treatments, viscosity modifiers, azeotropic distillations, artificial organs, lubricants, asphalt additives, water‐soluble polymers, hollow spheres, cross‐linking agents, and catalyst treatments. Styrene is the largest volume acrylonitrile comonomer for thermoplastic applications. Styrene–acrylonitrile (SAN) copolymers are inherently transparent plastics with high heat resistance and excellent gloss and chemical resistance. They are also characterized by good hardness, rigidity, dimensional stability, and load‐bearing strength. In general, the styrene component of SAN resins offers clarity, stiffness, and processibility, while the acrylonitrile provides chemical and heat resistance. Because of their inherent transparency, SAN copolymers are most frequently used in clear application. These optically clear materials can be readily processed by extrusion and injection molding, but they lack real impact resistance. SAN resins show considerable resistance to solvents and are insoluble in carbon tetrachloride, ethyl alcohol, gasoline, and hydrocarbon solvents. Polar solvents dissolve SAN. The properties of SAN are significantly altered by water absorption. Commercially, SAN is manufactured by three processes: emulsion, suspension, and continuous mass polymerization. More than 75% of the SAN resin produced is believed to be used captively for acrylonitrile–butadiene–styrene compounding and in the production of acrylonitrile–styrene–acrylate and acrylonitrile–EPDM–styrene weatherable copolymers. SAN resins appear to pose few health problems, and they have been approved by the FDA for direct food contact. Copolymers of acrylonitrile and methyl acrylate and terpolymers of acrylonitrile, styrene, and methyl methacrylate are used as barrier polymers. Acrylonitrile multipolymers containing indene; methyl methacrylate, and α‐methylstyrene are used as poly(vinyl chloride) modifiers for heat distortion temperature and processibility improvement.

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