Synthesis and characterization of some new Schiff base polymers

Seven Schiff base polymers poly 5,5′-methylenebis(2-hydroxyacetophenone)semicarbazone (PHASC), poly-5,5′-methylenebis(2-hydroxyacetophenone)thiosemicarbazone (PHATS), poly 6,6′-methylenebis(2-hydroxynaphthaldehyde)1,2-propylenediimine (PHNPn), poly 6,6′-methylenebis (2-hydroxynaphthaldehyde)1,3-propylenediimine (PHNPR), poly 6,6′-methylenebis (2-hydroxy-naphthaldehyde)thiosemicarbazone (PHNTS), poly 6,6′-methylenebis(2-hydroxy-naphthaldehyde)urea (PHNU) and poly-6,6′-methylenebis(2-hydroxynaphthaldehyde)semicarbazone (PHNSC) were prepared by polycondensation of 5,5′-methylenebis(2-hydroxyacetophenone) (MHA) or 6,6′-methylenebis(2-hydroxynaphthaldehyde) (MHN) with semicarbazide, thiosemicarbazide, 1,2-propylenediamine, 1,3-propylenediamine or urea. The polymers were characterized by elemental micro-analysis, infrared and ultraviolet spectroscopy and viscosity measurements. The reduced viscosity of the polymers measured in dimethylformamide (DMF) was observed in the range 0.32–0.63 dl/g.