Dielectric relaxation dynamics of Al/epoxy micro-composites

JOURNAL OF ALLOYS AND COMPOUNDS

卷:689

Article

Wang, Zijun¹  Zhou, Wenying^1,2  Dong, Lina¹  Sui, Xuezhen¹  Zuo, Jing¹  Cai, Huiwu¹  Liu, Xiangrong¹  Chen, Qingguo²  Cai, Jiangtao¹ 

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

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

关键词: Polymers;    Elastomers and plastics;    Semiconductors;    Dielectric response;   

DOI  :  10.1016/j.jallcom.2016.07.332

来源: Elsevier

【 摘 要 】

The dynamic dielectric properties of the Al/epoxy composites were investigated by means of broadband dielectric spectroscopy spectrometer with the frequency range 1-10(7) Hz at the temperature of -20-200 degrees C. Three relaxation processes are detected in the dielectric spectra as a function of temperature and frequency: (1) Maxwell interfacial polarization (IP) at low frequencies and high temperatures; (2) a primary alpha-relaxation process near T-g at the middle frequencies; and (3) Intermediate dipolar effect (IDE) relaxation at high frequencies above -20 degrees C. The dynamics of all the recorded processes include contributions from both polymer and the inorganic reinforcing phases. The analyses of loss tangent and electric modulus spectrum of the composites indicate that the chain segmental dynamics of the polymer are accompanied by the absorption of energy given to the system. Finally, the alternating current (AC) conductivity spectra support the hopping type of conduction in the composites and the ionic conduction relaxation processes are observed also. (C) 2016 Elsevier B.V. All rights reserved.

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