Nanofillers are a class of particles that are applied to polymeric composites and other materials to improve some of their properties. Manufacturing and investigation of properties of the composites recently have focused attention of many laboratories in polymer science. The main problem in the mixing process of polymers and fillers is the incompatibility of these materials. Inorganic compounds are hydrophilic, while main types of polymers are hydrophobic. For good mixing the fillers should be modified to obtain hydrophobic layer at the surface. In recent work we have concentrated our attention on using a new method to modification of classical nanofillers: layered aluminumsilicates known as montmorillonites and occurred in bentonites. Modification of the different types of bentonite using maleic anhydride and other organic anhydrides as modifying agents and ionizing radiation as a grafting method show that particles obtained in this process are good fillers for production of nanocomposites on a basis of polypropylene. Mechanism of modification of montmorillonite by the above method was tested using IR, ESR, WAXD and DSC techniques. The obtained polymeric materials were tested for mechanical and thermal properties. The features of some final materials were better than initial polypropylene. The best mechanical characteristics were obtained for polypropylene filled with modified domestic bentonite "Special".

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