THIN-LAYER CHROMATOGRAPHY ON POLYACRYLONITRILE .5. CONSIDERATION OF SEPARATION MECHANISMS OF SOME ALIPHATIC AND AROMATIC-AMINES

The chromatographic behaviour of ten aliphatic and aromatic amines on thin layers of polyacrylonitrile sorbent was investigated using seven aqueous solvent systems. It was established that an increase in the hydrophobic part of the amines results in their increased retention on this sorbent. A positive linear depencence between the number of carbon atoms in the n-alkyl groups of primary aliphatic amines and the corresponding R(M) values was also established. The separation of the investigated amines was assumed to be based on non-specific hydrophobic interactions between their non-polar parts and the hydrocarbon chains of the sorbent.