عنوان مقاله [English]
نویسندگان [English]چکیده [English]
One of the ways to improve the mechanical properties, thermal and rheological of polyurethane-silica nanocomposites is Surface modification of silica nanoparticles and incorporation modified nanoparticles in polyurethane matrix. This operation is done in two physical and chemical forms. Physical modification is performed based on the physical interactions between silica and modifying agents and the use of surfactants or macromolecules adsorption. chemical modification is performed based on the chemical interactions and using of the grafting to polymer chains and different modification agent based on silicon, boron, titanium, aluminum and etc. that usually silane coupling agent are more important. In order to investigate of amount of silica surface modification is used from different methods such as measurement of the heat of immersion in water and benzene and infrared spectroscopy. In this paper, methods for surface modification of silica with approach to incorporation in polyurethane and also effects of modification by different modification agent on the thermal properties, morphology and hydrophobicity are considered.