A reactive cationic surfactant cetyltrimethylammonium bromide (CTAB) was synthesized for intercalation of montmorillonite Mmt. a Maghnite type of clay. The pristine montmorillonite (Mmt) was obtained from Algerian plant with a cation exchange Organophilic Mmt was prepared by ion exchange between Na+ ions in the clay. CTAB-intercalated Mmt particles were easily dispersed and swollen in styrene monomer, poly(styrene) / Mmt-CTAB nanocomposites were synthesized via in situ polymerization, in-situ polymerization, this method is based on the swelling of the silicate layers with the liquid polymer. The polymer composites were characterized using different techniques such as X-ray diffraction (XRD), The results were showed that, the basal space of the silicate layer increased, as determined by XRD, from 12.79 to 32.603 Å and transmission electron microscopy TEM revealed that the modified montmorillonite layers were uniformly dispersed and exfoliated in the styrene matrix for low levels of clay. In our current research,we continue this research and study infrared spectrophotometery (IR), differentialscanning calorimetery (DSC), and balayage electron microscope (MEB) thermal gravimetric analysis (TGA), force atomic microscopy (AFM) and tensile measurements Keywords: cetyltrimethylammonium bromide, nanocomposite, force atomic microscopy, Organophilic