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These Book reports the research work done on synthesis of nanoparticles of CaCO3, CaSO4, Ca3(PO4)2 and Mg (OH) 2 in the various sizes by matrix mediated growth technique. For synthesis of nano inorganic particles, water-soluble polymer such as polyethylene glycol (m.wt 6000) was used; variation in its molar ratio was done to reduce the nano sizes of these fillers. The polyamide/ CaCO3, CaSO4,Ca3(PO4)2 and Mg (OH) 2 nanocomposites were prepared via melt intercalation on twin-screw extruder. Thermal properties of these nanocomposites were studied using DSC and TGA. Nano CaCO3, CaSO4, Ca3(PO4)2 and Mg (OH) 2 was added from 1 to be 4 wt % in the polyamide. These results were compared with respective commercial filler filled composites. Mechanical and Thermal Properties were studied. The effect of organically modified (OMMT) clay on polyamide nanocomposites was also studied.Moreover, rheological data like torque, fusion time, viscosity and shear rate were also recorded on Brabender Plasticorder. The data obtained on Brabender Plasticorder were correlated with M= CS a and ¿ =K (¿)n , which gave a power law index (n).This This value indicates pseudo plastic nature of the polyamide/OMMT