Thermoanalytical studies of some Schiff base polymers and their metal chelates

Thermogravimetry (TG) and differential thermal analysis (DTA) of poly 5,5'-methylene bis-salicylaldehyde-tetramethylenediimine (PMSATen), poly 5,5'-methylene bis-salicylaldehyde-meso-stilbenediimine (meso-PMSAS), poly 5, 5 '-methylene-bis-saticylaldehyde-dl-stilbenediimine (dl-PMSAS), poly 5,5'-methylene-bis-salicylaldehyde-2,6-diiminopyridine (PMSAP), and their copper (II) and nickel (II)) chelates were recorded in nitrogen atmosphere upto 800 degreesC. Loss in weight occurs in two to three stages. The polymers and their nickel chelates indicate better thermal stability as compared to their corresponding copper complexes. DTA shows a series of endotherms with maximum in the range of 40-700 degreesC.