Abstract
A complete one- and two-dimensional nuclear magnetic resonance (NMR) study was carried out on the styrene-acrylonitrile (SAN) dimer fraction of a sample of SAN thermal copolymer. A crude sample of SAN oligomers was first fractionated by distillation and then the dimers were isolated by thin-layer chromatography. The structures and stereochemistry of these compounds were then determined by NMR and the presence of disubstituted cyclobutanes was pointed out. This suggests that the Flory mechanism of initiation must be taken into account in spontaneous styrene-acrylonitrile copolymerization.
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