Morphological and chemical stabilities of polypyrrole in aqueous media for 1 year

Synthesis of Polypyrrole and Its Derivatives as a Liquid Marble Stabilizer via a Solvent-Free Chemical Oxidative Polymerization Protocol

“…This should be due to the nucleophilic attack of hydroxide ion during the dedoping in NaOH aqueous solution (pH 12), which introduced carbonyl groups that shorten the conjugation length in the products. 46,59 Elemental microanalysis studies confirmed that the amounts of chloride ion dopant were reduced by dedoping (Table 1). The numbers of Py rings per one chloride ion dopant were calculated based on the Cl/N ratios: 2.9 rings (doped) and 50.0 rings (dedoped) for PPy, 2.0 rings (doped) and 11.1 rings (dedoped) for PMPy, and 2.2 rings (doped) and 9.1 rings (dedoped) for PEPy.…”

“…This should be due to the nucleophilic attack of hydroxide ion during the dedoping in NaOH aqueous solution (pH 12), which introduced carbonyl groups that shorten the conjugation length in the products. 46 , 59 …”

“…The conjugate lengths of the PPy and its derivatives synthesized by solvent-free and aqueous chemical oxidative polymerizations were characterized by comparing the maximum absorption wavenumbers around 1531–1561 cm –1 . The wavenumber of maximum absorption around 1531–1561 cm –1 is known to increase for the shorter conjugation length caused by introduction of carbonyl group via overoxidation. , The maximum absorption wavenumbers of PPy and PMPy were 1547 cm –1 (solvent-free) and 1532 cm –1 (water medium) for PPy and 1563 cm –1 (solvent-free) and 1547 cm –1 (water medium) for PMPy. These results indicated that the conjugate lengths of PPy and PMPy synthesized by the solvent-free chemical oxidative polymerization were shorter than those synthesized by the aqueous chemical oxidative polymerization.…”

“…Compared with the doped sample, the conjugation lengths were shortened in all systems, considering higher wavenumbers. This should be due to the nucleophilic attack of hydroxide ion during the dedoping in NaOH aqueous solution (pH 12), which introduced carbonyl groups that shorten the conjugation length in the products. , …”

Synthesis and validation of ultrasensitive stripping voltammetric sensor based on polypyrrole@ZnO/Fe3O4 core–shell nanostructure for picomolar detection of artesunate and dopamine drugs

“…This behavior may be due to the presence of Ppy film on the surface of the modifier, which has a p K a ≈ 9–10, resulting in deprotonation of the surface at pH 9.5–10. 50 This may increase the possibility of [PZM] to bond with different types of detected molecules, depending on the charge of the detected molecules (positively or negatively charged molecules) and the pH medium of the analyte.…”