Features of the Structure and Physical-Chemical Properties of Poly-Ortho-Toluidine Doped with Toluenesulfonic Acid

A.L Stepura,P.Yu Demchenko,O.I Aksimentyeva

doi:10.15330/pcss.20.1.82

A.L Stepura, P.Yu Demchenko + Show 1 more

Open Access

https://doi.org/10.15330/pcss.20.1.82

Copy DOI

Abstract

 Features of crystal structure, electrical conductivity and thermal stability of poly-ortho-toluidine (PoTi) samples, obtained with method of oxidative polymerization in the environment of sulfuric and toluenesulfonic acids (TSA), were investigated. It was discovered that PoTi-TSA samples are characterized withhigh crystallinity. According to the physico-chemical analysis, doping samples with TSA causes increase of PoTi thermal stability, electrical conductivity and sensor sensitivity on the contrary to samples doped with sulfuric acid. Based on temperature dependence of specific resistance, were calculated the values of the conductivity activation energy, which are within the limits of 0.2-0.4 eV depending on the type of dopant.

Highlights

Among the family of conductive polymers significant interest for research have polyaminoarenes (PA), which are as objects in many studies, because of their low price, great stability, simplicity of synthesis and possibility of control doped and undoped state, using acid-base interaction [1,2,3,4,5]
That’s why an important issue is to study the influence of the dopant nature on the structure and physical-chemical parameters of conductive polymers
The doped forms of PoTi-toluenesulfonic acids (TSA) or PoTi-H2SO4 were obtained in the form of emeraldinium salt, what was evidenced with the bright green color of the samples

Summary

Introduction

Among the family of conductive polymers significant interest for research have polyaminoarenes (PA), which are as objects in many studies, because of their low price, great stability, simplicity of synthesis and possibility of control doped and undoped state, using acid-base interaction [1,2,3,4,5]. Along with widely investigated polyaniline, currently are actively studied its derivatives – polyaminoarenes, in particular, poly-ortho-anisidine [2], poly-ortho-toluidine [3,4] and others [5] Special interests have their physical-chemical properties such as optical absorption, electrical conductivity and sensory sensitivity [6]. Due to the presence of alkyl substitute of the aromatic ring, these conductive polymers have improved solubility in comparison with polyaniline, and due to the features of the polymer chain structure, new functional properties can be detected

Objectives

Methods

Results