Polarography Acrylonitrile monomer

Styrene-acrylonitrile copolymers Aqueous, alcoholic, oily Acrylonitrile monomer Polarography [87, 88]... 

METHOD 55 - DETERMINATION OF STYRENE AND ACRYLONITRILE MONOMERS IN STYRENE - ACRYLONITRILE COPOLYMERS. CATHODE-RAY POLAROGRAPHY ... 

Determination of styrene and acrylonitrile monomers in styrene-acrylonitrile copolymers. Cathode-ray polarography... 

The applicability of the azeotropic-distillation procedure described by Daues and Hamner [2] for separating acrylonitrile monomer from interfering impurities before polarography was examined. In this procedure the aqueous sample is distilled in the presence of a mixture of methanol and aqueous sulfuric acid. The methanol-acrylonitrile azeotrope, boiling at 61.4 °C, distils first from this mixture and thus the acrylonitrile is recovered in the initial distillate. 

Applications As the basic process of electron transfer at an electrode is a fundamental electrochemical principle, polarography can widely be applied. Polarography can be used to determine electroreductible substances such as monomers, organic peroxides, accelerators and antioxidants in solvent extracts of polymers. Residual amounts of monomers remain in manufactured batches of (co)polymers. For food-packaging applications, it is necessary to ensure that the content of such monomers is below regulated level. Polarography has been used for a variety of monomers (styrene, a-methylstyrene, acrylic acid, acrylamide, acrylonitrile, methylmethacrylate) in... 

Methods have been described for determining styrene and acrylonitrile (dimethyl formamide extraction-polarography) and styrene, acrylonitrile and butadiene monomers (solution in dimethyl formamide-gas clnomatography). Acrylonitrile has been determined by polarography and by gas chromatography of a dimethyl formamide solution. The polarographic method also determines methacrylonitrile. Styrene monomer has been determined by a polarographic method. ... 

---