Dielectric spectroscopy characterization of relaxation process in Ni/epoxy composites

JOURNAL OF ALLOYS AND COMPOUNDS

卷:682

Article

Wang, Zijun¹  Zhou, Wenying^1,2  Dong, Lina¹  Sui, Xuezhen¹  Cai, Huiwu¹  Zuo, Jing¹  Chen, Qingguo² 

[1] Xian Univ Sci & Technol, Polymer Res Inst, Coll Chem & Chem Engn, Xian 710054, Peoples R China

[2] Harbin Univ Sci & Technol, Key Lab Engn Dielect & Its Applicat, Minist Educ, Harbin 150080, Peoples R China

关键词: Polymers;    Metals;    Semiconductors;    Dielectric response;   

DOI  :  10.1016/j.jallcom.2016.05.025

来源: Elsevier

【 摘 要 】

Nickel (Ni)/epoxy composites with different Ni filler additions were prepared, and the dynamic dielectric properties of the composites were investigated using broadband dielectric spectroscopy spectrometer with the frequency range 1-10(7) Hz at the temperature of -20 to 200 degrees C. The dielectric properties as a function of temperature and frequency show three relaxation processes: (1) Maxwell interfacial polarization at low frequencies; (2) a primary alpha-relaxation process at near glass transition temperature (T-g); and (3) ionic conduction relaxation at the middle frequencies between 100 degrees C and 200 degrees C. Detailed studies of modulus spectrum suggest non-Debye type of relaxation mechanism for the composites. The Cole-Cole plots exhibit the contribution of filler concentration effect in the modulus characteristics of the Ni/epoxy composites. Alternating current (AC) conductivity and electric modulus studies support the hopping type of conduction in the composites, and frequency dependent AC conductivity data obey Jonscher's power law. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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