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'-me thylene bis-salicylaldehyde-meso-stilbenediimine (meso-PMSAS), poly 5, 5 '- methylene-bis-saticylaldehyde-dl-stilbenediimine (dl-PMSAS), poly 5,5'-meth ylene-bis-salicylaldehyde-2,6-diiminopyridine (PMSAP), and their copper (II ) and nickel (II)) chelates were recorded in nitrogen atmosphere upto 800 d egreesC. Loss in weight occurs in two to three stages. The polymers and the ir nickel chelates indicate better thermal stability as compared to their c orresponding copper complexes. DTA shows a series of endotherms with maximu m in the range of 40-700 degreesC.