Investigation on dielectric relaxation of PMMA-grafted natural rubber incorporated with LiCF _3SO _3

摘要

Natural rubber (NR) grafted with 30 wt% poly (methyl methacrylate) (PMMA) and designated as MG30 has been added with varying amounts of LiCF _3SO _3. X-ray diffraction (XRD) shows the samples to be amorphous. Fourier transform infrared (FTIR) spectroscopy indicates complexation between the cation of the salt and the oxygen atom of the CO and -COO- groups of MG30. From electrochemical impedance spectroscopy (EIS), MG30 with 30 wt% LiCF _3SO _3 salt exhibits the highest ambient conductivity of 1.69×10 ~(-6) S cm ~(-1) and lowest activation energy of 0.24 eV. The dielectric behavior has been analyzed using dielectric permittivity (ε'), dissipation factor (tan δ) and dielectric modulus (M ~+) of the samples. The dielectric constant of pure MG30 has been estimated to be ～1.86.