Nem ve sıcaklık algılama için iletken poli(o-toluidin)/kaolinit kompozitlerinin sentezi ve karakterizasyonu

Year 2018, Volume: 24 Issue: 7, 1278 - 1283, 28.12.2018

Filiz Boran Sevil Çetinkaya Meral Karakışla Mehmet Saçak

Abstract

İletken poli(o-toluidin)/kaolinit kompoziti,
kaolinit varlığında yükseltgen olarak amonyum persülfat kullanılarak
o-toluidinin kimyasal polimerizasyonu ile hazırlandı. Hazırlanan iletken
kompozitin nem ve sıcaklık algılayıcısı olarak kullanımını araştırabilmek için
kompozitin içerdiği iletken POT miktarı ve kompozitin iletkenlik değerlerine
polimerizasyon koşullarından HCl, o-toluidin ve yükseltgen madde derişimlerinin
etkisi incelendi. En yüksek poli(o-toluidin) miktarı (%29.4) ve iletkenliğe
sahip (8.3×10^-4 Scm^-1) kompozitin 0.2 M amonyum
persülfat, 0.4 M o-toluidin ve 1.0 M hidroklorik asit kullanılarak 20 °C
sıcaklıkta ve 2 sa. sürdürülen polimerizasyon ile elde edildiği bulundu. Saf
poli(o-toluidin) ve poli(o-toluidin)/kaolinit kompozitinin direnç değerleri
0-100 °C sıcaklık aralığında tekrar edilen ısıtma-soğutma işlemleri sırasında
izlenerek sıcaklığa karşı duyarlılığı incelendi. Bağıl nem oranı %30-90
arasında değiştirilen ortamlarda saf poli(o-toluidin) ve kompozitin direnç
değerleri ölçülerek nem sensör davranışı belirlendi. Hazırlanan kompozitin
karakterizasyonu Fourier dönüşümlü kızılötesi spektroskopisi (FT-IR), X-Işınları kırınımı (XRD), termogravimetrik analiz (TGA) ve taramalı
elektron mikroskobu (SEM) teknikleri ile yapıldı.

Keywords

Poli(o-toluidin), Kaolinit, Kompozit, İletken polimer, Sıcaklık sensör, Nem sensör

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

Abstract

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).

Keywords

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

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