Influence of Organomodified Ni-Al Layered Double Hydroxide (LDH) Content on the Thermal Properties and Degradation Kinetics of Polystyrene (PS)/Ni-Al LDH Nanocomposites Prepared via Solvent Blending Method

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Abstract
A series of polystyrene (PS) nanocomposites with various concentration of organomodified Ni-Al LDH (3, 7 wt%) were synthesized by solvent blending method and the effect of Ni-Al LDH content on the thermal properties and degradation kinetics of PS/ Ni-Al LDH nanocomposites was examined. Thermogravimetric analysis (TGA) was employed to evaluate the thermal properties of the prepared PS nanocomposites with various content of Ni-Al LDH. The obtained TGA results reveal that the PS/Ni-Al LDH nanocomposites exhibits enhanced thermal stability when compared with pure PS and the thermal stability of the nanocomposites increase with an increase in the LDH content from 3 to 7 wt%. When 15% weight loss is selected as a point of comparison, the thermal decomposition temperature of the PS/Ni-Al LDH nanocomposite containing 7 wt% of LDH is about 28°C higher than that of pure PS. The thermal degradation kinetics of the nanocomposite materials are investigated using two kinetic models such as Flynn-Wall-Ozawa method and Friedman method. The improvement of thermal stability of the nanocomposites with increasing LDH content is also validated by increasing the activation energies.

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