Poly(phenylenesulfidephenylenamine) (PPSA)—the “Compound” of Polyphenylenesulfide with Polyaniline

Abstract

COMMUNICATIONSwere investigated in situ at the solid-liquid interface using a scanning tunneling microscope (STM) constructed in our institute 1151. The tunneling tips were electrochemically etched (21.i KOH + 61.i NaCN) from a0.25 mm Pt/Ir (80:20) wire. After the investigation of the pure CJsA solution. a drop of pure Py or DMPy was added. After a few minutes. images of the stoichiometric compound could be recorded. Unless mentioned otherwise, the STM images were obtained in constant height mode under ambient conditions (scan rate: 0.3 Hz per image, positive tip bias.U , = 0.1 to 1 0 V. I , = 0.5 to 1 nA). They were recorded on videotape in real time and digitized later. Data are reported as recorded without digital image processing. Single crystals suitable for X-ray crystal structure analyses [5,6] were grown by slow evaporation of T H F solutions CrystaI structure analyses were performed on an Enraf-Nonius CAD4 diffractometer. by using graphite-monochromated Cu,, radiation (i=1.5405 A). The structures were solved by direct methods (SIR 88, Molen) and refined b! full-matrix least squares analyses with anisotropic temperature factors for C. N. iind 0. The H atoms were refined in the riding mode with fixed isotropic temperature factors.

Novel Approach to Ladder-Type Polymers: Polydithiathianthrene via the Intramolecular Acid-Induced Cyclization of Methylsulfinyl-Substituted Poly(meta-phenylene sulfide)

“…However, only the linear product 22 a was obtained, implying that the condensation reaction occurred selectively in the position para to the activating sulfide bridges. This regioselectivity has also been observed in the intermolecular acidinduced polycondensation reactions towards the linear PPS, [9,10] PPSA [11,12] and PPSAA. [13] …”

“…For the preparation of the single-stranded PDT-precursor, dithioresorcine (18) was reacted with 1,3-dichloro-4,6-dimethylsulfinylbenzene (11) in DMAC in the presence of potassium carbonate at 100 8C for 24 h (Scheme 8). After work-up, polymer 23 was isolated as a colorless powder which was soluble in solvents such as CH 2 Cl 2 , CHCl 3 and DMF.…”

“…[8] The key-step of the synthesis is an acidinduced intramolecular condensation reaction of a singlestranded methylsulfinyl substituted precursor. The intermolecular version of this condensation reaction is well known for the preparation of high molecular weight poly(para-phenylene sulfide) (1, PPS) [9,10] , poly(paraphenylene sulfide-phenylenenamine) (2, PPSA) [11,12] and poly(para-phenylene sulfide-phenyleneamine-phenyleneamine) (3, PPSAA) [13] . Herein we focus on the transfer of this concept towards the synthesis of oligomers with thianthrene units and of polydithiathianthrene (4, PDT) (Scheme 1).…”

Synthesis and Characterization of Electrochromic Polyamides with Well‐Defined Molecular Structures and Redox Properties

“…[5] In addition, many efforts have been devoted to investigate the PANI structure synthesized by chemical and electrochemical means, and the data reveal that most PANI exhibits an ill-defined structure and has limited solubility in a handful of organic solvents. [6] It is therefore a very important challenge to design the synthesis of PANI and its derivatives in a form that is easily processible and applicable, and at the same time gives the final product a well-defined structure.…”

Electroactive polyurea/CNT composite-based electrode for detection of vitamin C

“…However, the PANI synthesized by chemical and electrochemical methods shows low solubility in common solvents. In addition, few synthesized PANIs have defined structures and precise oxidation-reduction states [8], which make it difficult to understand the electron transport mechanisms in PANI. For these reasons, aniline oligomers can be considered as good model compounds for researching specific behaviours of PANI [9].…”