Síntese e caracterização de polianilina usando como meio ácido a bixina

Abstract

Polyaniline (PANI) is obtained from aniline, from chemical polymerization in an acid medium, and may presentconductive properties. The aim of this study was tosynthesize a bixin NIBP using bixin as my acid medium; Characterize NIBP by means of physical-chemical techniques. Compare the properties of the new NIBP bixin synthesized with the NIBP (standard). The synthesis of PANI bixin, was performed using an ice bath with salt and alcohol, at temperatures between -3°C and -5°C, mixing in a 1000 mL beaker, the ammonium persulfate ((NH4)2S2O8) dissolved in 40 mL, the pure bixin dissolved in 0.5 mol/L of sulfuric acid and aniline, this mixture remaining in mechanical stirring for 2 hours. The resulting mixture was stirred for 24 hours on a mechanical stirrer.The results obtained are shown through characterization analyzes. The synthesized NIBP thermogravimetric (TG) analyzes indicated mass losses in the ranges of 98ºC to 690ºC. In the DSC he indicated the endothermic curves, in the ranges of 150ºC to 400ºC. UV-vis absorption spectroscopy, indicates the vibrations and transitions of the NIBP molecules, in a scanning range between 300 nm to 780 nm. Raman spectroscopy indicates a high intensity of the new Nixin NIBP, occurring between the ranges of 530 to 1600 cm-1. Bixin PANI indicated better stability, degrading at 240ºC, greater conductivity of 1.7 S / cm-1 and greater intensity at 1500 cm-1 compared to PANI / H2SO4 (standard PANI), reaching a conclusion that PANI bixin can be used for the same purposes as PANI / H 2SO4. The characterizations show that PANI bixin is effective both for the use of electronics, being used in sensors, and for the area of health in wound healing.