Effects of solvent interactions on the structure and properties of prepared PAni nanofibers

Abstract

The changes of structure and properties of nanofibers were studied as a function of solubility parameters of the organic solvents that are used in interfacial polymerization of polyaniline (PAni) nanofibers. The presence of UV-visible absorbance at 340, 440, and 800 nm confirmed the formation of emeraldine salt structure of the prepared PAni nanofibers. Fourier transform infrared spectral results indicate an increasing trend of benzenoid to quinoid ratio with the decrease of interaction of the solvents with aniline. This can be correlated to the increase in the degree of conjugation of the polymer chain. Photoluminescence study revealed an increase in the density of defect state with the decrease of interaction. Single-line approximation technique was used to analyze the broadening of the most intense X-ray reflection peak corresponding to (110) plane of the nanofibers. The greater the solvent-monomer interaction, the lesser was the domain length and p-stacking of the PAni chains. The study of this interaction is instrumental to precisely control the internal conformation of the PAni nanofibers. V C 2012 Wiley Periodicals, Inc. J Appl Polym Sci 126: [830][831][832][833][834][835][836] 2012

Preparation and application of polyaniline nanofibers: an overview

“…This is potentially a great advantage because a large variety of organic solvents can be selected as the organic phase . However, the solubility parameters of the organic solvents used in the interfacial polymerization of PANI nanofibers have an effect on their structure and properties . The difference in the monomer–solvent interaction leads to the variation in the degree of conjugation, domain length, d ‐spacing and strain.…”

“…57 However, the solubility parameters of the organic solvents used in the interfacial polymerization of PANI nanofibers have an effect on their structure and properties. 58 The difference in the monomer-solvent interaction leads to the variation in the degree of conjugation, domain length, d-spacing and strain. The benzenoid-to-quinoid ratio tends to increase when the interaction of the solvent with aniline decreases, which can be correlated to the increase in the degree of conjugation of the polymer wileyonlinelibrary.com/journal/pi (2) Aniline concentration.…”

Electrospinning of polyvinyl butyral in different solvents

“…Many studies showed that solvent has a big role on final fiber [21][22][23][24]. Lubasova et al explained what the poor and good solvents are for PVB by applying a Hansen Solubility Parameter (HSP).…”

Soluble polyaniline nanofibers prepared via surfactant-free emulsion polymerization

“…However, in the XRD pattern of fumaric acid-doped PANI, two broad bands centered at 21 and 24.8 as reported before [39] and three acute absorption peaks, observed at 2u = 22.74 , 28.72 , 29.32 , represent its partially crystalline structure. The acute peaks at 2u = 22.74 and 28.72 are ascribed to the periodicity parallel and perpendicular to the polymer chains of PANI, respectively [40], different from the typical broad reflections of the HCl-doped PANI at around 19.2 and 26 [41]. Its crystallinity of 27.75% according to the calculation indicates that the dopant of fumaric acid improved the PANI crystallinity.…”