Endgroup study of chlorate–sulfite‐initiated acrylonitrile copolymer

Abstract

synopsisQuantitative determination of endgroups in an acrylonitrile-methyl acrylate (90 : 10) copolymer polymerized with NaC10a-Na&30a redox system in aqueous solution was carried out by conductometric and dyeing methods for SOaH incorporated into polymer, x-ray analysis for S in polymer, and polarography for C1 in polymer. The number-average molecular weight was measured by osmometry. Determination of endgroups was done on both unfractionated polymer and fractionated polymer. On the average, 0.95 mole S and 0.71 mole SOaH per molecule were found in unfractionated polymer. For fractionated polymer, 0.68 mole S and 0.69 mole SOaH per molecule were found. A small amount of C1 was also found in both unfractionated polymer and fractionated polymer. The difference between results for the two polymers and polymerization kinetics are d i s CUSSed.