Synthesis and Study of the Polyhdrazides for Semipermeable Membrane for Desalination

Abstract

A series of some newer polyhydrazides was synthesized in order to study the structure-property relationship for membranes. The properties studied under the influence of chain variation between two aromatic rings were chain flexibility, hydrogen bonding, solubility, inherent viscosity, thermogravimetric and differential thermal analysis etc. The polyhydrazides were prepared by low temperature solution polycondensation of terephthalic/isophthalic acid hydrazides with different aromatic and aliphatic diacid chlorides. The inherent viscosities varied from 0.09–0.24 dL/g. The normal region of weight loss was 300–465ºC. The polymer melt temperature (Tm) and glass transition temperature (Tg) were found in the range of 110–310ºC and 73.3–206.6ºC respectively.