Abstract
Specific Polyaniline (PANI) morphologies such as nanotubes and nanofiber are required for enhancing its performance in the various applications. CO2 ـــassisted Polyaniline polymerization is a method recently used to produce these anticipated morphologies. In this study, polyaniline nanotube was prepared successfully in the presence of compressed CO2 utilizing Aniline as a monomer and Ammonium peroxydisulfate (APS) as an oxidizing agent. The effect of both reaction temperature and the oxidizing agent feed rate on the morphology and surface area of the produced PANI was investigated. The synthesized PANI was examined by FT-IR, XRD, and BET surface area analysis. Furthermore, SEM was carried out to figure out the morphology of the prepared PANI. It was indicated that Polyaniline nanotubes PANNTs size and homogeneity were affected by the reaction temperature. The averages of the outer and inner diameters of the PANNTs at 25 o C, 45 o C, 65 o C were found to be about (120, 60 nm), (140, 65 nm), and (175, 75 nm) respectively. Also, the produced surface area was slightly augmented with the increase of the temperature. In addition, it was observed that increasing the feeding rate of the APS was associated with the reduction of the size and the surface area of the produced PANI nanotubes.
Highlights
The porosity and morphology of Polyaniline (PANI) are the most effective properties that concern its performance [1, 2]
Insignificant PANI surface area may restrict the use of PANI powder in many applications, but it may be overcome by manufacturing PANI nanotubes (PANNTs) [3]
Regarding the improvement of the PANI surface area and attaining advanced PANI morphology, the polymerization temperature and the feed rate of the ABS impact on the manufactured PANI was observed by SEM, BET surface area analysis, XRD, and FT-IR
Summary
The porosity and morphology of Polyaniline (PANI) are the most effective properties that concern its performance [1, 2]. PANI can be synthesized in different morphologies as nanofiber, nanoparticles, nanorods, and nanotubes. In order to prepare the PANI in advanced morphologies and in a high porous structure, polymerization assisted with subcritical or supercritical CO2 was used [6,7,8,9]. Polymerization of PANI in subcritical and supercritical CO2 still needs more investigations to demonstrate the influence of different parameters on the produced morphology. In this experimental investigation, PANNTs was prepared by CO2-assisted polymerization. The influence of the reaction temperature and the APS feed rate into the reaction vessel on the attained PANI Morphology and Surface area were acquired
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