Sharif Digital Repository

Polystyrene/organoclay nanocomposites were prepared by melt intercalation method in this research. Morphology, tensile and impact properties and deformation mechanism of the samples were studied. To study the structure of nanocomposites, X-ray diffraction and transmission electron microscopy techniques are utilized. The deformation mechanisms of different samples were examined via reflected and transmitted optical microscopy. The results reveal that incorporation of organoclay affects structure, mechanical properties and deformation mechanism of nanocomposite. Introduction of organoclay can facilitate initiation and growth of crazing mechanism in polystyrene at both conditions of loadings,... 

A novel approach for particles size separation based on dielectrophoresis (DEP) method is introduced and analyzed both computationally and experimentally. The proposed technique has been utilized for the separation of polystyrene (PS) particles with 8, 6 and 2 μm diameters passing through microchannels with planar electrodes. The performance of the technique has been computationally analyzed using the finite element method (FEM). Considering the structure of the planar electrodes, we propose an approach based on applying an electric potential between one of the global electrodes, and a needle touched the top of the cell suspension. Results of both simulation and experiment show that by... 

Polystyrene- (Styrene Ethylene Butylene Styrene-Maleic Anhydride) (SEBS-MA) composites with/without organoclay were prepared by melt intercalation method. The morphology, tensile and impact properties and deformation mechanism of these compounds were investigated. X-ray diffraction, transmission electron microscopy and reflected and transmitted optical microscopy techniques were used to study the morphology and deformation mechanisms. The results show that incorporation of SEBS with/without organoclay notably affects morphology, mechanical properties and plastic deformation of polystyrene. Introduction of SEBS with/without organoclay can facilitate initiation and growth of crazing mechanism...