Thermal Degradation Behavior of Polyaniline in Polyaniline/Tunsten Carbide Composite

Abstract:

Polyaniline/tungsten carbide (PANI/WC) composite was synthesized by chemical oxidative polymerization of aniline using ammonium persulfate as the oxidant and thermal treated in air at 150°C, 250°C, 350°C and 450°C to 2 hours. The changes of structure, crystalline and conductivity were investigated by Fourier Transformed Infrared (FT-IR), Fourier Transformed Raman (FT-Raman), X-Ray Diffraction (XRD) and four-probe technique. The results showed that PANI/WC composite showed much-improved thermal stability compared to pure PANI. But the conductivity of PANI/WC is reduced to some extent (1.73 S/cm, the conductivity is reduced by about 82%) after thermal treated at 250°C, and dropped by 6 orders of magnitude (3.25×10-6S/cm) at 350°C. This may be explained by that only a fraction of dopant losses during thermal treatment at 250°C, but after thermal treatment at 350°C, along with cross-linking, chain scission and oxygen, resulting in destruction of crystal structure, decrease of the emeraldine sequence.

• Periodical: Advanced Materials Research (Volumes 581-582)
• Pages: 719-722
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.581-582.719
• Online since: October 2012
• Authors: Hui Huang, Ren Chun Fu, Zhong Cheng Guo
• Keywords: Composite, Degradation Behavior, Polyaniline, Thermal Treatment, Tungsten Carbide

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