Novel dielectric behaviors in PVDF-based semiconductor composites

• Published in: Journal of applied polymer science Vol. 122; no. 5; pp. 3466 - 3473
• Main Authors: Xu, Hai-Ping, Xie, Hua-Qing, Yang, Dan-Dan, Wu, Yi-Hua, Wang, Jing-Rong
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 05.12.2011; Wiley; Wiley Subscription Services, Inc
• Subjects: Applied sciences; Composites; Dielectric constant; dielectric property; Dielectrics; Exact sciences and technology; Fillers; Forms of application and semi-finished materials; Materials science; Nickel; Percolation; Polymer industry, paints, wood; polymer-matrix composites; Polymers; Polyvinylidene fluorides; Semiconductors; Technology of polymers; thermal properties; Zinc; dielectric property; polymer-matrix composites; Carbon black; Semiconductor materials; Dielectric properties; Temperature effect; Experimental study; Metal particle; Composite material; Zinc; thermal properties; Tungsten; Vinylidene fluoride polymer; Concentration effect; Percolation; Nickel; Permittivity
• ISSN: 0021-8995; 1097-4628; 1097-4628
• DOI: 10.1002/app.34362

Composites of polyvinylidene fluoride (PVDF) filled with different conductive fillers as carbon black (CB), nickel (Ni), zinc (Zn), and tungsten (W), respectively, were prepared at same processing condition. The temperature dependence of dielectric behaviors of composites was studied at wide filler concentration and wide frequency ranges. Results show that there are giant dielectric constants as the concentration of filler is near the percolation threshold. The dielectric constants of all studied composites decrease slowly with increasing of frequency and rise gradually with increasing filler contents in the composites. Two relaxation peak regions of dielectric constant are observed from −30 to 40°C and from 100 to 150°C, which can be attributed to the contribution of polar effect of PVDF. The CB filled PVDF (CB/PVDF) composites present a lower percolation threshold than other metallic‐filler filled PVDF composites. The maximal dielectric constant was found in the Ni filled PVDF (Ni/PVDF) composite. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011