Alkaline Stability of Polyaniline Synthesized Using Pulsed Inductively Coupled Plasma Device

摘要

The stability of polyaniline synthesized using pulsed inductively coupled plasma device was studied in alkaline media. Polyaniline was exposed to potassium hydroxide at 25°C and 90°C for various time intervals up to 4 months. An increase in %mass loss, the decreases in the absorbance intensities of polyaniline characteristic bands in FT-IR and UV-Visible spectra and the reduction of the conductivity with increasing exposure time to alkaline solution and/or temperature indicated the increases in the conversion of polyaniline into its base form and the degradation of its structure. The results also suggested that the temperature was the main factor affecting its conductivity in alkaline stability since exposing at 25°C and 90°C caused the conductivity to decrease from 4.53×l0~(-8) S.cm~(-1) to 1.74×l0~(-8) S.cm~(-1) and 8.15×l0~(-9) S.cm~(-1) in 4 months, respectively. Therefore, this polyaniline synthesized via this system may be suitable for the applications at room temperature where alkaline stability is needed.