▎ 摘　　要

Graphene and its nanocomposites were prepared via solution mixing process. Graphene based polymer nanocomposites were prepared by two step process. Firstly, graphene/poly(3-methyl thiophene)(PMT)/BaTiO3 nanocomposite was prepared by in situ chemical oxidation polymerization technique. In the second step these nanocomposites were dispersed in thermoplastic polyurethane (TPU) matrix by solution blending process. All the four nanocomposites in TPU [30 % modified graphene (P1), 30 % Poly(3-methyl thiophene) (P2), 30 % graphene/PMT/BaTiO3 (P3) and 15 % graphene/PMT/BaTiO3 + 15 % Fe3O4 (P4)] were analyzed by different analytical techniques like X-ray diffraction (XRD), scanning electron microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDX) and transmission electron microscopy (TEM). Microwave absorbing property was measured by Agilent vector network analyzer (ENA E5071C) in the X-band region (8-12 GHz). Microwave absorption result was interpreted with the help of complex permittivity and permeability of the prepared materials. Matching of both dielectric loss and magnetic loss is essential for an effective radar absorbing material (RAM). P1, P2, P3 and P4 showed the maximum return loss of -14.37, -9.3, -30.02 and -47.59 dB respectively. Thermal stability of the RAMs was determined by the help of thermogravimetric analysis (TGA) instrument. Among the all, P4 showed better thermal property. All results support their use as RAM in different field.