Thermal properties of melt processable polyaniline (PANI) synthesized by doping with functionalised novel sulfonic acid dopants have been investigated. Doping of PANI was carried out by using the dopants derived from an inexpensive naturally existing biomonomer, cardanol: sulfonic acid of 3-pentadecylphenol, sulfonic acid of 3-pentadecylanisole and sulfonic acid of 3-pentadecylphenoxyacetic acid. These dopants act as very good plasticizing cum protonating agents for PANI. Doping was carried out either by mechanical mixing of emeraldine base and the dopant or by an in situ doping emulsion polymerization of aniline. Highly conducting free-standing¯exible ®lms of protonated PANI could be prepared by a hot pressing method at different temperatures. The thermal stability and thermal reactions of these protonated PANI were followed by conductivity measurements at different temperatures, wide angle X-ray diffraction measurements, thermogravimetric analysis and differential scanning colorimetry analysis.
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