Preparation and characterization of polypyrrole/cellulose fiber conductive composites doped with cationic polyacrylate of different charge density

Abstract

Polypyrrole/cellulose fiber-conductive composites were chemically synthesized in situ by using, for the first time, cationic polyacrylate copolymer as dopant and FeCl 3 as oxidant. The impacts of dopant charge density on the adsorption of the dopant on cellulose fiber, microstructure, tensile strength, conductivity and stability were investigated. In addition, the elemental composition, distribution and doping state of the polypyrrole in conductive fiber were determined by elemental analysis and X-ray photoelectron spectroscopy. Compared with anthraquinone-2-sulfonic acid sodium salt, cationic polyacrylate copolymer was a more effective dopant in increasing the conductivity and conductivity stability of conductive paper. The decay of mechanical properties was also weakened. The surface resistivity decreased from 4.6 to 0.3 KX square -1 with increasing dopant charge density from 0.525 to 0.820 lmol g -1 and then increased with a further increase in the dopant charge density. It was also found that the polypyrrole retention in conductive fiber reached the maximum when the charge density of the dopant was 0.820 lmol g -1 . When the conductive fiber was doped with high-charged dopant, polypyrrole was easier to enter into the fiber lumen, and bipoloran charge carriers were more easily formed. With respect to the conductive fibers prepared with dopant of 0.820 and 0.525 lmol g -1 charge density, the total content of polaron and bipolaron in the former conductive fiber was higher than the content of polaron in the latter conductive fiber. In addition, uniform and denser nanofibrous PPy can be formed by controlling the dopant charge density.

3D Photothermal Cryogels for Solar-Driven Desalination

“…Furthermore, there is an intense peak at 1551 cm –1 that may be attributed to (i) a red-shifted CO stretching of carboxylate (observed at 1570 cm –1 for PSA sample) due to its interaction with PPy in PPC10 and/or (ii) enhanced fundamental vibration of the pyrrole rings at (1551 cm –1 ). In addition, the appearance of new bands at 790, 1896, and 2122 cm –1 , which are the aromatic group vibration frequencies, indicate that the presence of PSA as a dopant may have also enhanced charge delocalization into the pyrrole rings . Note that the bands at 1896 and 2122 cm –1 are the overtones of the out-of-plane CH bending as evident by the bands at 790, 904, and 964 cm –1 .…”

“…In addition, the appearance of new bands at 790, 1896, and 2122 cm –1 , which are the aromatic group vibration frequencies, indicate that the presence of PSA as a dopant may have also enhanced charge delocalization into the pyrrole rings. 59 Note that the bands at 1896 and 2122 cm –1 are the overtones of the out-of-plane C—H bending as evident by the bands at 790, 904, and 964 cm –1 . Another difference observed at the PPC10 sample compared to the spectrum of pure PPy is the blue shift of the peaks attributed to C—N stretching from 1111 to 1177 cm –1 and from 1028 to 1039 cm –1 .…”

Facile approach to fabricate waterborne polyaniline nanocomposites with environmental benignity and high physical properties

“…m. Kg −1 . In our previous reported study, the mechanical property of conductive paper prepared through in situ chemical oxidation polymerisationis generally inferior to the original paper, owing to the acid hydrolysis and the weakened interaction among fibres5758. Therefore, surface coating is an effective methodology to simultaneously improve the conductivity and mechanical property of conductive paper.…”

Review of electrically conductive composites and films containing cellulosic fibers or nanocellulose

“…The preparation methods affect the microstructure, mechanical strength, and conductivity of polypyrrole/cellulose composites (Wang et al 2015b). Saravanan et al (2017) improved the conductivity of polypyrrole/cellulose composite by adding a mixture of styrene-triazine sulfonate sodium salt and 9,10-anthraquinone-2-sulfonate sodium salt.…”