boran, filiz hitit university - engineering faculty - department of chemical engineering, Çorum, Turkey , çetinkaya, sevil cumhuriyet university - engineering faculty - department of chemical engineering, Sivas, Turkey , karakişla, meral ankara university - faculty of science - department of chemistry, Ankara, Turkey , saçak, mehmet ankara university - faculty of science - department of chemistry, Ankara, Turkey

Synthesis and characterization of poly(o-toluidine)/kaolinite conductive composites for humidity and temperature sensing

41203

Conductive poly(o-toluidine)/kaolinite composite was synthesized via chemical polymerization of o-toluidine in the availability of kaolinite using ammonium persulfate as oxidizing agent. To investigate the use of the prepared conductive composite as humidity and temperature sensor, the effect of polymerization conditions such as HCl, o-toluidine and oxidant concentrations on the amount of conductive POT contained in the composite and the conductivity values of composites were investigated. It was found that the composites with the highest poly (o-toluidine) content (29.4%) and conductivity (8.3×10-4 Scm-1) were obtained by 0.2 M ammonium persulfate, 0.4 M o-toluidine and 1 M hydrochloric acid for 2 hours of continuous polymerization at 20 °C. The resistivity values of pure poly(o-toluidine) and poly (o-toluidine)/kaolinite composite were monitored during heating-cooling cycles in the range of 0-100 °C. Changes in resistivity for pure poly(o-toluidine) and poly(o-toluidine)/kaolinite composite with humidity 30-90% were examined and humidity sensor behavior was determined. Characterization of the prepared composite was performed by Fourier transform ınfrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and scanning electron microscopy techniques (SEM).

1278

Poly(o , toluidine) , Kaolinite , Composite , Conductive polymer , Temperature sensor , Humidity sensor

Pamukkale University Journal Of Engineering Sciences

1283