INVESTIGATION OF PHYSICOCHEMICAL AND THERMAL PROPERTIES OF CLAY-HYDROGEL COMPOSITES

Year 2023, Volume: 11 Issue: 2, 439 - 448, 01.06.2023

Firdevs Çirli , Gülcihan Güzel Kaya , Hüseyin Deveci

https://doi.org/10.36306/konjes.1218991

Abstract

Hydrogels are cross-linked polymeric networks which retain large amounts of water. The hydrogels with response capability to various stimuli such as pH and temperature have received great attention in many fields. In this study, hydrogels were synthesized by free radical solution polymerization through optimization of acrylamide/sodium acrylate mole ratio and ethylene glycol dimethacrylate content. With the addition of sepiolite as filler into the hydrogel network which had highest swelling percent, hydrogel composites were obtained. In the presence of 10 wt% sepiolite, maximum swelling percent was determined as approximately 10600%. Swelling properties of the hydrogel composite including 10 wt% sepiolite was investigated depending on pH, salt effect and temperature. With increasing pH value, swelling percent of the hydrogel composite showed an increase. At high temperatures, the hydrogel composite exhibited higher swelling percent. Swelling tests in 0.1 M NaCl, CaCl2 and FeCl3 solutions revealed that the lowest swelling percent was observed in 0.1 M FeCl3 solution. Fourier transform infrared spectroscopy (FTIR) analyses verified successfully preparation of the hydrogel composites. Regular layers of the sepiolite in the hydrogel network which made water diffusion easily were shown by scanning electron microscopy (SEM) analyses. Thermogravimetric analyses (TGA) indicated that thermal stability of the hydrogel network was increased with the addition of sepiolite.

Keywords

Sepiolite, Hydrogel, Swelling Ratio, Thermal Properties

Kil-Hidrojel Kompozitlerinin Fizikokimyasal ve Termal Özellikleri

Abstract

Hidrojeller, yapısında fazla miktarda su tutabilen çapraz bağlı polimerik ağlardır. pH ve sıcaklık gibi çeşitli uyaranlara cevap verebilme kabiliyeti olan hidrojeller birçok alanda dikkat çekmektedir. Bu çalışmada akrilamit/sodyum akrilat mol oranının ve etilen glikol dimetakrilat miktarı optimize edilerek serbest radikal çözelti polimerizasyonu ile hidrojeller sentezlenmiştir. En yüksek şişme yüzdesine sahip olan hidrojel ağına dolgu maddesi olarak sepiyolit ilavesiyle hidrojel kompozitler hazırlanmıştır. Ağırlıkça %10 sepiyolit varlığında maksimum şişme yüzdesi yaklaşık %10600 olarak belirlenmiştir. pH, tuz etkisi ve sıcaklığa bağlı olarak ağırlıkça %10 sepiyolit içeren hidrojel kompozitin şişme özellikleri incelenmiştir. pH değerinin artışı ile hidrojel kompozitin şişme yüzdesi artış göstermiştir. Yüksek sıcaklıklarda hidrojel kompozit daha yüksek şişme yüzdesi göstermiştir. 0,1 M NaCl, CaCl2 and FeCl3 çözeltilerinde yapılan şişme testleri en düşük şişme yüzdesinin 0,1 M FeCl3 çözeltisi içerisinde olduğunu açığa çıkarmıştır. Fourier dönüşümlü kızılötesi spektroskopisi (FTIR) analizleri hidrojel kompozitlerin başarılı bir şekilde sentezlendiğini kanıtlamıştır. Kolay bir şekilde su difüzyonunu sağlayan sepiyolite ait düzenli tabakalar taramalı elektron mikroskobu (SEM) ile gösterilmiştir. Hidrojel ağının termal kararlılığının sepiyolit ilavesi ile arttırıldığı termogravimetrik analizler (TGA) ile belirlenmiştir.

Keywords

Sepiyolit, Hidrojel, Şişme Oranı, Termal Özellikler

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