TABLE OF CONTENTS Wheeler [1] has reviewed the available literature on the applications of paper chromatography in the examination of polymers for antioxidants (Table 6.1). He points out that, as most antioxidants are highly polar, they cannot be efficiently separated on normal paper except by the use of highly polar mobile phases. Consequently reversed-paper chromatography [2-5] or acetylated papers [6-9] have been used to reduce the effects of tailing . Various workers have discussed the determination of antioxidants in rubber extracts [10-14].
| Systematic name | Trade name | Colour of reaction product | Identification limits before/after chromatographic separation, g | R f values | |
|---|---|---|---|---|---|
| 1 Phenyl- ?-naphthylamine | Neozone A | Light yellow | 5 | 10 | 0.64 |
| 2 Phenyl- ?-naphthylamine | Neozone D | Blue-grey | 5 | 20 | 0.64 |
| 3 Diphenyl- p-phenylenediamine | JZF | Yellow-orange | < 1 | 2 | 0.56 |
| 4 Phenyl-cyclohexyl- p-phenylenediamine | Alterungsschutzmittel | Yellow | < 1 | 10 | 0.73 |
| 5 Di- ?-naphthyl- p-phenylenediamine | Agerite White | Pink | 1 | 5 | 0.55 (Tailing) |
| 6 p-Isopropoxydiphenylamine | e.g. in Agerite Hipar, a mixture of 2, 3 and 6 | Yellow-brown | - | - | 0.73 |
| 7 p, p ?-Dimethoxy-diphenylamine | e.g. |
