The effect of carboxylic acid group on conductivity of the aromatic polyazomethines and char composites

Abstract

One of the properties gained by COOH groups of polymer, exists in aromatic polyazomethine (PAM) in the main chain, is the increase in the conductivity. In this study, the PAMs including carboxylic acid in subgroups as condensation polymerization products were obtained. The electrical conductivity of the polymers was enhanced by many orders of magnitude by PAM. The carboxylic acid group increase the electrical conductivity in two ways are: (i) increasing chain flexibility and (ii) allowing movement of the charge carrier more easily along the chain. Additionally, in this study, the polymer composites were obtained using the carbon material (char) derived from the 400°C pyrolysis of waste polyethylene terephthalates. It was observed that conductivity also increased due to char in the composites formed by the PAMs with char. The lowest Eg value of 0.55 eV was determined in poly‐2‐carboxyl‐1,4‐bis[(diphenylether)methylene]phenylenediamine/char composite. The structures of the obtained polymers were confirmed by FTIR, UV–vis, TGA,1H NMR, and EDX techniques. The molecular weight distribution parameters of the synthesized compounds were determined with the size exclusion chromatography. POLYM. COMPOS., 35:372–380, 2014. © 2013 Society of Plastics Engineers

Enhanced properties of phthalonitrile‐terminated polyarylene ether nitriles embedded with hybrid MWCNT–boehmite nanocomposites

“…4a (curve a). There is a narrow absorption peak at 1720 cm 21 belonging to the C@O of carboxyl group, which is consistent with reports in the literature [23]. The characteristic absorption bands of MWCNTboehmite to distinguish from MWCNT were observed from curve b.…”

Study on the reuse of marble and andesite wastes in epoxy‐based composites

“…Conductive polymer composites have many advantages over metallic conductors. They are lighter (in weight), provide corrosion resistance, offer a wide range of electrical conductivity and can be easily shaped with a low cost . Recently, PANI/polymer blends have attracted considerable attention since a very low amount of PANI can make the polymer conductive while maintaining the properties of the other polymer.…”

Lycopene loaded polylactic acid (PLA) and PLA/copolymer electrospun nanofibers, synthesis, characterization, and control release

“…Unlike the others, adding of PAA as a copolymer significantly increased the electrical conductivity of the solution. The carboxylic groups of PAA, increases the electrical conductivity of the solution by increasing the flexibility of the chains and also allowing better conduction of the charge carrier (Ozaytekin, 2014). With increasing PAA percentage, there was a decrease in electrical conductivity, partly due to increased viscosity of the solution (Table 2).…”

“…This change in surface morphology for PLA fibers because of incorporation of hydrophilic copolymers (PAA and PEO) could be attributed to incompatibility of them with PLA as the hydrophobic polymer. The aforementioned changes in diameter and surface morphology of fiber cannot be totally related to the changes in viscosity and electrical conductivity of the used mixture (Ozaytekin, 2014). As can be seen (Table 2), incorporation of copolymers led to the same changes in viscosity and electrical conductivity of the mixtures and the viscosity and electrical conductivity of all samples were increased and decreased, respectively (Alves et al., 2019; Aguirre Calvo et al., 2017; Priamo et al., 2011; Shi et al., 2012).…”