NDLI: Thermal and electrical properties of epoxy composites at high alumina loadings and various temperatures

Content Provider	Springer Nature Link
Author	Wu, Xinfeng Jiang, Pingkai Liu, Fei Xie, Liyuan Wang, Ying Yu, Jinhong
Copyright Year	2012
Abstract	Epoxy microcomposites with high loading micro alumina (Al$_{2}$O$_{3}$, 100–400 phr) were prepared by casting method and their thermal and electrical properties were studied at temperatures from 25 to 150 °C. The electric resistance device and the dielectric electrode device were designed to measure the electrical properties of the composites. Thermogravimetric analysis (TGA) and scanning electron microscopic proves the homodispersion of Al$_{2}$O$_{3}$ microparticles in epoxy. TGA indicates that the temperature of 5 % weight loss of epoxy/Al$_{2}$O$_{3}$ (100 phr) composite is 366 °C, 34 °C higher than that of pure epoxy. Differential scanning calorimetry shows that the glass transition temperature of epoxy/Al$_{2}$O$_{3}$ composite (400 phr) increases to 114.7 °C, 9.2 °C higher than that of pure epoxy. Thermal conductivity test demonstrated that with increasing Al$_{2}$O$_{3}$ content at 25 °C, thermal conductivity of epoxy/Al$_{2}$O$_{3}$ composites increased to 1.382 W/(m K) which is 5.62 times that of pure epoxy. Electrical tests demonstrate that by increasing of Al$_{2}$O$_{3}$ content and temperature, the electric resistance and dielectric properties of the composites show great dependencies on them. Resistivities of all the specimens decreased with the increasing of temperature owing to the increasing molecular mobility in the higher temperature. Resistivity of pure epoxy at 25 °C is about 9.56 × 10$^{16}$ Ω cm, about one order of magnitude higher than that of pure epoxy at 125 °C and two orders of magnitude higher than that of pure epoxy at 150 °C. These results can give some advice to design formulations for practical applications in power apparatus.
Starting Page	61
Ending Page	73
Page Count	13
File Format	PDF
ISSN	10261265
Journal	Iranian Polymer Journal
Volume Number	22
Issue Number	1
e-ISSN	17355265
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-11-13
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polymer Sciences Epoxy Dielectric property Ceramics, Glass, Composites, Natural Methods Thermal conductivity Alumina Thermal stability
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Chemical Engineering Polymers and Plastics

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