Archive / Volume LXXVIII 2025

Yuliia STETSIV¹, Oleg VERESHCHAGIN², Mykhaylo YATSYSHYN¹, Oleksandr RESHETNYAK¹

¹Ivan Franko National University of Lviv, Kyryla & Mefodiya Str., 6, 79005 Lviv, Ukraine
e-mail: yuliia.stetsiv@lnu.edu.ua

²SE Tylose GmbH & Co. KG, Rheingaustraße, 190−196, 65203 Wiesbaden, Germany

OPTICAL PROPERTIES OF POLYMER-POLYMER COMPOSITE FILMS BASED ON CELLULOSE AND POLYANILINE

In the present work, the flexible cellulose-polyaniline (Cel/PAn) composite films have been successfully synthesized by in situ oxidation polymerization method and formed by solution casting and solvent evaporation. The aniline was polymerized with ammonium peroxodisulfate as oxidant in an aqueous solution of cellulose in 0.5 M citric acid (CA) at room temperature. The cellulose-polyaniline films were obtained by using different volume ratios of component solutions, namely cellulose:aniline (Cel:An) – 1:0.01, 1:0.02 та 1:0.04, respectively. The photos of obtained samples showed that homogenous distribution of polyaniline in the composites. The structural properties of the cellulose, polyaniline and cellulose-polyaniline composites were also analyzed using Fourier transform infrared spectroscopy (FTIR) and ultraviolet-visible spectroscopy (UV-vis) methods, respectively. The FTIR recorded a decrease in the intensities of cellulose-polyaniline, indicating the successful incorporation of polyaniline in the composite. The effect of polyaniline content on the optical properties of the obtained samples was studied. The absorption edge, optical band gap and number of carbon cluster were estimated. The optical band gaps were obtained by Tauc’s relation from UV-vis absorption spectra. It was found that the optical band gap of the direct transition of cellulose-polyaniline composite films decreases from 2.76 to 2.46 eV, where synthesized with a 4-fold increase in the mass content of aniline, respectively. The Urbach energy values were increased with the increase of polyaniline content. In addition, carbon clusters of cellulose-polyaniline films number is enhanced from 155 to 196. Moreover, the optical coefficients such refractive indexes of the cellulose-polyaniline films were determined. This work provides a straightforward method to prepare flexible cellulose-polyaniline films, which could be applied in sensors, flexible electrodes and flexible displays.

Keywords: polyaniline, сellulose, films, band gap.

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