Highly soluble polyaniline was synthesized from a newly designed aniline derivative, namely 2‐[2‐chloro‐1‐methylbut‐2‐en‐1‐yl]aniline. The corresponding polyanilines, PClPA‐HA, PClPA‐SA, PClPA‐NA and PClPA‐PA, were characterized by means of 1H NMR, 13C NMR, high resolution mass spectroscopy, Fourier transform infrared spectroscopy, ultraviolet–visible spectroscopy and SEM images. The elemental analysis and electrical conductivity of the polymers are also presented. It is shown that the molecular weight of the polymers obtained depends on the method of synthesis. Spectroscopic studies confirmed the emeraldine form of the polyaniline derivatives. In the work, the dependence of the current passing through resistive structures based on thin poly[2‐(2‐chloro‐1‐methylbut‐2‐en‐1‐yl)aniline] films on the relative humidity of air was studied. The results of the studies showed the prospects of using thin polymer films in the design of chemical sensors. © 2020 Society of Chemical Industry

The bicontinuous lyotropic liquid phases surrounded by the isotropic phase form monocrystals with well-developed facets. We investigate the structure and stability of the facets formed by the bicontinuous phase of Pn3̅m symmetry, at three preferred directions, which are developed on a spherical droplet of Pn3̅m phase surrounded by the isotropic phase. The structure of the facets is obtained by minimization of the Landau-Brazovskii functional with one scalar order parameter.

Phase diagrams of phytantriol/ethanol/water and phytantriol/DSPG/ethanol/water systems are explored and experiments on facetings of Pn3m-in-L1 and Im3m-in-L1 crystals are performed. Observed crystal habits do not agree with the Friedel-Donnay-Harker rules. We argue that this paradox can be explained in terms of constraints imposed on Pn3m/L1 and Im3m/L1 interfaces by the bicontinuous topology of the cubic phases. We point out that when free edges of the surfactant bilayer are prohibited at these interfaces, the two labyrinthes separated by the bilayer cannot anymore be equivalent. The corresponding [Formula: see text] and [Formula: see text] symmetry breakings are unveiled by the abnormal facetings.

This work is focused on modifying aniline monomers with various characteristics that allows one to study the effect of the substituent on the respective polymer.

A series of new soluble N-substituted poly(β-haloallylanilines), namely poly[N-(2-chloroprop-2-en-1-yl)aniline] (NPC), poly[N-(2-chloroprop-2-en-1-yl)-2-methylaniline] (NPT) and poly[N-(2-chloroprop-2-en-1-yl)-2-methoxyaniline] (NPA), were synthesized by oxidative polymerization in 1M HCl medium using (NH4)2S2O8 as the oxidant. Based...

Intramolecular acid-catalyzed cyclization was suggested for the first time for a polyaniline derivative, namely, poly­[2-(2-chloro-1-methylbut-2-en-1-yl)­aniline] (PClPA), to give hitherto unknown poly­(2-ethyl-3-methylindole) (2E3MPIn) in a high yield (81%). This is the first example of synthesizing a polymer of the indole series with 1,5-addition of monomeric units that are incorporated into the polymer structure. The physicochemical properties of the new polymer were studied. Its structure was confirmed by spectral methods and quantum-chemical calculations. The 2E3MPIn polymer showed good thermal stability compared to the starting PClPA polymer. A study of the photoluminescence of polymers showed that the emission spectrum of 2E3MPIn demonstrated a bathochromic shift (16 nm) and a considerable increase in the luminescence intensity in comparison to PClPA. The 2E3MPIn sample was found to possess photoconductivity. Irradiation of the polymer film increases the electrical conductivity by a factor of 2. The electrochemical properties obtained from the UV–vis spectrum and cyclic voltammograms suggest that 2E3MPIn has good electroactivity. A sample of 2E3MIn demonstrates a fine porous structure resembling a “sponge”. In addition, the PClPA and 2E3MPIn samples synthesized were used as sensitive materials in resistive moisture sensors. The 2E3MPIn polymer demonstrated a higher response than PClPA to changes in the environment humidity. The observed changes in the physicochemical properties of 2E3MPIn compared to PClPA confirm that the polyheterocyclization reaction occurs successfully and can be considered as an efficient way for synthesizing new functional polymers of the indole series.

This study is the first report that includes the experimental data on the use of a wide range of new substituted polyaniline (PANI) derivatives as a sensitive material in sensors.

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