SYNTHESIS AND CHARACTERIZATION OF A RIGID POLY(AMIDE HYDRAZIDE) - EFFECT OF SOME REACTION PARAMETERS ON THE VISCOSITY OF THE POLYMER FORMED

A wholly aromatic all-para a oriented poly(amide hydrazide) has been s ynthesized from N,N'-bis(4-aminobenzoyl) hydrazine (BABH) and terephth aloyl chloride (TC) by low temperature solution polycondensation. The polymer was characterized by elemental analyses, IR spectroscopy, solu bility, viscosity and density measurements. The effect of various fact ors controlling the polymerization reaction (concentration of monomer and electrolyte (LiCl) in the reaction medium, nature of the medium an d temperature at the initial stage of polymerization) on polymer visco sity was studied. To prepare a polymer of high viscosity, the optimum conditions were found to be, monomer concentration 0.25 moll(-1). LiCl concentration (in DMAc) 1% (w/v), with use of N-methyl pyrrolidone (N MP as polymerization medium. The thermal behaviour of the polymer was studied in air and nitrogen by TGA and DSC.