Thermal Stabilization of Polypyrrole by Incorporation of Aromatic Sulfonate Derivatives as Dopants

Abstract

Thermal stability of electric conductivity of polypyrrole (PPy) was improved using aromatic sulfonate derivatives as dopants having mobile hydrogen in the form of acid groups such as sulfonic acid, carboxylic acid, or hydroxide groups. Particularly, when m-sulfobenzoic acid or 5-sulfosalicylic acid were used as dopants, the PPy showed high thermal stability of electric conductivity and kept 95% electric conductivity even after heating for 8 h at 150 °C in air.

Magnetic and Electron Transport Behaviors of Conductive‐Polymer Nanocomposites

“…The conductive polymer needs be very stable at a negative potential during electropolymerization in order to serve as an electrode. A PPy thin film doped with m-sulfobenzoic acid has high conductivity in the order of 100 S cm À1 in air, at relatively high temperatures, in a reductive agent and with negative potential, which provides the opportunity for electrodeposition applications [64]. The electrochemical synthetic approach has been used to produce a multilayered structure with a conductive polymer as the substrate [65].…”

Polymerising pyrrole on polyester textiles and controlling the conductivity through coating thickness

“…The longer heating time and higher temperature result in increase charging on the sample surface. The loss in conductivity was attributed to oxidation and deprotonation at N-atom of the pyrrole ring [25][26][27][28]. Some parts of the coating was found to be considerably damaged by heat treatment, which manifested as electrical charging on the fibre surface as seen in the SEM images in Fig.…”

Preparation of Some Substituted Terephthalic Acids.

“…[8] The resultant 2-methylterephthalic acid (3) is esterified, [9] then side-chain brominated with NBS, to produce dimethyl 2-bromomethylterephthalate (4). [9,10] Compound 4 is then subjected to treatment with aqueous Na 2 SO 3 , in the presence of Bu 4 NBr as catalyst, in a process of nucleophilic replacement of bromine by a sulfonate anion. [11] The resultant sodium salt 5 is treated with conc.…”

“…The resultant mixture was stirred at ambient temperature for 1 h, followed by 12 h at 60 8C. It was then poured into an aqueous solution of NH 4 Cl, and the organic layer was separated. The aqueous fraction was saturated with NaCl, and the organic layer was separated.…”

“…The best-known example among them is 2-sulfoterephthalic acid, which has been employed in the preparation of rigid-rod polymers, [1,2] polymers with enhanced solubility, [3] dopants for electrically conductive polymers, [4] and enzyme inhibitors for glaucoma treatment. [5] Our recent attempts at preparation of sulfonic acid-pendant poly(benzimidazole) (SPBI) demonstrated that conducting the polymerization at elevated temperatures, necessary for satisfactory chain length, triggers an adverse process of desulfonation and an accompanying loss of solubility of the resultant polymer.…”