Dielectric properties, Impedance analysis, and electrical conductivity of Ag doped radiation grafted polypropylene | ||||
| Egyptian Journal of Radiation Sciences and Applications | ||||
| Article 10, Volume 30, Issue 1, December 2017, Page 95-107 PDF (2.05 MB) | ||||
| Document Type: Review papers | ||||
| DOI: 10.21608/ejrsa.2017.1260 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Lobna Aly Abd El-Wahab  1; Amr El-Hag Ali2
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| 1head of Radiation Research Division, atomic Energy | ||||
| 2National Center for Radiation Research and Technology- Atomic Energy Authority, Cairo, Egypt | ||||
| Abstract | ||||
| The possibility of obtaining relatively high dielectric constant polymer-metal composite by incorporating silver nanoparticles in a polypropylene (PP) polymer matrix by grafting and successive reduction method was demonstrated. Frequency and temperature dependence of AC conductivity and dielectric constant (ε') and dielectric loss (ε'') in pure polypropylene, PP-g-(AAc-co-Sty), and PP-g-(AAc-co-Sty)-Ag nanocomposite are studied in the frequency range 50 Hz- 5 MHz and in the temperature range 30- 70 oC. The experimental results show that the polarity of PP is weak due to deficiency of polar groups. The values of ε' and ε'' increased dramatically with the addition of silver nanoparticles in polypropylene. The obtained AC conductivity is follow the correlated barrier-hopping model (CBH) since the frequency exponent (s) and AC conductivity are both frequency and temperature dependent. The calculated value of maximum barrier height Wm for PP-g-(AAc-co-Sty)-Ag is 0.242eV. The dielectric relaxation process are studied in respect of the electric modulus formalism. | ||||
| Keywords | ||||
| grafting; polypropylene; Nanocomposite; Silver nanoparticles; impedance; Electric modulus | ||||
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