Synthesis and characterization of a rigid poly(amide hydrazide): effect of some reaction parameters on the viscosity of the polymer formed

✍ Scribed by Mandal, Rabindranath; Maiti, Sukumar

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 253 KB
• Volume: 44
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/(sici)1097-0126(199712)44:4<428::aid-pi841>3.0.co;2-3

✦ Synopsis

A wholly aromatic all-para oriented poly(amide hydrazide) has been synthesized from N,N@-bis(4-aminobenzoyl) hydrazine (BABH) and terephthaloyl chloride (TC) by low temperature solution polycondensation. The polymer was characterized by elemental analyses, IR spectroscopy, solubility, viscosity and density measurements. The e †ect of various factors controlling the polymerization reaction (concentration of monomer and electrolyte (LiCl) in the reaction medium, nature of the medium and temperature at the initial stage of polymerization) on polymer viscosity was studied. To prepare a polymer of high viscosity, the optimum conditions were found to be, monomer concentration 0É25 mol l~1, LiCl concentration (in DMAc) 1% (w/v), with use of N-methyl pyrrolidone (NMP) as polymerization medium. The thermal behaviour of the polymer was studied in air and nitrogen by TGA and DSC.