The dynamic and electrical properties of composites remain a serious concern in application. In this article, 0.1 wt% multi‐walled carbon nanotubes (MWCNTs) are tested to improve the dynamic and electrical properties of three synthesized aromatic poly(amide hydrazides). The inclusion of 0.1 wt% of MWCNTs into these polymer matrices resulted in enhancement of electrical conductivity of nanocomposites compared to unmodified polymer by 104 times. Also, an obvious increase of storage modulus, both dielectric constant (ε′) and dielectric loss (ε″) are enhanced and higher values of complex viscosity are obtained for the novel composites compared to unmodified polymers. FTIR data proved that the inclusion of MWCNTs did not affect the functionalities on the polymer chains. In addition, the dispersion of MWCNTs into bare polymer matrices is studied using transmission electron microscope, scanning electron microscope, and atomic force microscope. POLYM. COMPOS., 39:E842–E852, 2018. © 2017 Society of Plastics Engineers

The review summarizes the various methods of preparing wholly aromatic polyamide–hydrazides (PAHs). Polyhydrazides are a class of polymers that possess in their repeating units one amide (–NHOC–) and one hydrazide (–CONHNHOC–) linking bond between appropriate aromatic nuclei. The review provides several figures of different molecular structures of PAH and expounds the methods of polymerization, low, high temperature, and phosphorylation polycondensation methods. Polyhydrazides exhibit some unique and potentially useful properties such as outstanding thermal and thermo-oxidative resistance, very high mechanical strength, and ultrahigh moduli. PAHs undergo structural transformation into poly(amide-1,3,4-oxadiazole)s upon heating, which are also considered highly thermally stable polymers. The review presents a description of the structure–property relation of PAHs. The application of PAHs in reverse osmosis applications has been discussed, as well as the preparation of fibers and metallized PAHs films. Modification of the PAH with carbon nanotubes and graphene and the future prospects for PAHs were introduced with comprehensive references pertaining to this area of research.