Polarography styrene monomer

The procedure of Kuta and Quackenbush [121] can be modified for the determination of relatively simple organic peroxides such as benzoyl peroxide, para-tert-huty perbenzoate and lauroyl peroxide in PS, and would no doubt be suitable for the determination of other types of peroxides. In these procedures a suitable weight of polymer is dissolved in toluene and then an equal volume of 0.6 M lithium chloride in methanol is added. Precipitated polymer is removed by centrifuging and peroxides in the filtrate are determined by cathode-ray polarography. Polymerisation additives, styrene monomer or antioxidants in the polymer do not interfere in the polarographic procedure. A procedure for the determination of down to 20 ppm para-tert-hu.ty perbenzoate in PS is given next. [Pg.122]

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. ... [Pg.72]

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... [Pg.671]

Styrene-acrylonitrile copolymers Aqueous, alcoholic, oily Acrylonitrile monomer Polarography [87, 88]... [Pg.644]

METHOD 55 - DETERMINATION OF STYRENE AND ACRYLONITRILE MONOMERS IN STYRENE - ACRYLONITRILE COPOLYMERS. CATHODE-RAY POLAROGRAPHY ... [Pg.291]

Determination of styrene and acrylonitrile monomers in styrene-acrylonitrile copolymers. Cathode-ray polarography... [Pg.515]

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