بن اعمر احمد2024-09-192024-09-192024-03-07https://dspace.univ-msila.dz/handle/123456789/44282The thesis addresses the topic of “Elaboration and study of the properties of bentonite/acrylic polymer based material composites” based on tripropylene glycol diacrylate (TPGDA) and bentonite. In this research, we conducted three studies. The interest was initially in studying the kinetics and mechanisms of phase transformations of local raw bentonite from Maghnia (Algeria), after the calcination process at different temperatures, and as a result, the physicochemical properties were studied using (XRD) and (FTIR) devices. (SEM) of the calcined samples, then the material was examined by differential thermal analysis (DTA) at different heating rates (10- 50°C/min). Through the examination, we experimentally calculated the activation energy for the dehydroxylation reaction stage. With the help of the theoretical aspect, when it was treated in two different ways, the first by holding the temperature constant, and the second by changing it at different heating speeds, and after the calcination process at 200 and 700 °C for the bentonite, the X-ray diffraction data showed a decrease in the value of the separation distance (d001), which expresses the montmorillonite phase, from 12.72. Å at room temperature to about 11.98 Å and 9.93 Å and then disappearing after calcination at 800°C. The values of the average activation energies determined by the Kissinger method are 221.046 kJ/mol and the Ligero method are 233.076 kJ/mol. As for the second study, the cross-linked nanocomposite was prepared from tripropylene glycol diacrylate (TPGDA) and montmorillonite (pure local bentonite), where cation exchange of montmorillonite was performed using potassium chloride (KCl), sodium chloride (NaCl), and lithium chloride (LiCl). As a source of K+, Na+, and Li+ cations, respectively, the physicochemical properties of the prepared samples were then studied using (XRD), (FTIR), (SEM), and (TGA) devices, which demonstrated the success of intercalation of TPGDA monomers and their crosslinking within the montmorillonite layers to obtain On the Cross-linked(TPGDA)/MMtMag-M+ nanocomposite, based on the DTG curve, we calculated the activation energy and kinetic parameters in the TPGDA decomposition stage for each sample using the Coats–Redfern model. As for the third study, we studied the electrical insulation properties of the nanocomposite Cross-linked (TPGDA)/MMtWy-Cs+ over a frequency range from 12 to 200 MHz and in a temperature range from 293 to 373 K, where we relied on Wyming montmorillonite as a reinforcement material for this compound. The results showed that adding TPGDA to MMtWy-Cs+ resulted in improved AC conductivity, dielectric constant, and angular loss (tanδ) compared to pure MMtWy.otherbentoniteDifferential thermal analysisKinetic parametersActivation energyDehydroxylation. nanocompositesdielectric properties.Thesis