The ionic liquids due to their remarkable properties such as nonflammable, high thermal, negligible vapor pressure, low toxicity and their simple reusability have been widely used as solvent or catalyst in esterification reactions . In the first part of this work, four acidic ionic liquids were prepared and characterized by 1 H-NMR and FT-IR spectra. They were used as solvent and catalysts for esterification reactions of acrylic acid and ethanol. The experimental results were followed by gas chromatography (GC). [MNP-H]HSO 4 shows the best catalytic activity in esterification reaction. In the next part of the project, polyacrylate/graphene oxide (PA/GO) nanocomposites were synthesized with different amount of GO (1%, 3% and 5%). The nanocomposites were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction analysis (XRD), field emission scanning electron microscopy (FE-SEM) and Transmition electron microscopy (TEM). XRD pattern of prepared nanocomposite exhibit a peak shift to lower 2?. The mentioned shift, illustrates that GO layer distance increase compare to GO. Mechanical and thermal properties of synthesized nanocomposites were investigated by strain-stress analysis and thermo gravimetric analysis (TGA) respectively. Based on strain-stress analysis it seems that PA/GO (1%) has a lower crosslinked density compared to PA/GO (3 and 5 %). According to the TGA analysis PA/GO (1%) shows higher char yield compare to neat polymer. In contrast PA/GO (3 and 5%) shows more degradation relative to pure polymer.