INVESTIGATION OF PHYSICOCHEMICAL AND THERMAL PROPERTIES OF CLAY-HYDROGEL COMPOSITES

Authors : Firdevs ÇİRLİ, Gülcihan GÜZEL KAYA, Hüseyin DEVECİ

Pages : 439-448

Doi:10.36306/konjes.1218991

View : 46 | Download : 61

Publication Date : 2023-06-01

Article Type : Research Paper

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 insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(SEM); analyses. Thermogravimetric analyses insert ignore into journalissuearticles values(TGA); indicated that thermal stability of the hydrogel network was increased with the addition of sepiolite.
Keywords : Sepiyolit, Hidrojel, Şişme Oranı, Termal Özellikler