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《Acta Materiae Compositae Sinica》 2018-06
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Broadband dielectric spectroscopy on α and β relaxation of aluminum trihydroxide/epoxy composites

WU Qingzhou;LOU Chunming;PENG Zongren;LI Jin;LI Yuan;CHEN Mao;Key Laboratory of Pulsed Power,Institute of Fluid Physics,CAEP;State Key Laboratory of Electrical Insulation and Power Equipment,Xi'an Jiaotong University;  
The application of polymer is limited by its relaxations behaviors.The main research of this paper was focused on the effect which the aluminum trihydroxide(ATH)filler has onαrelaxation andβrelaxation of epoxy composites.And the broadband dielectric spectroscopy technology was applied to investigate such effect in this paper.In our experiments,the test condition was that the broad frequency of broadband dielectric spectroscopy ranged from 0.1 Hz to 2 MHz and the temperature of the broadband dielectric spectroscopy was from-100℃to 100℃,also the inorganic filler must be the ATH powder with the particle size of 2μm.The pure epoxy resin and the epoxy resin to which was added different proportion(0%,20%,40%,60%,80%and 100%)of the fillers were prepared and the dielectric properties of each of them was measured.The results show that,the quantities of the inorganic fillers have little effects onαrelaxation but have an obvious and significant effect onβrelaxation.With the quantities of the inorganic fillers increasing,the Vogel temperature decreases at first and then increases.On the contrary,theβrelaxation apparent activation energy of ATH/epoxy composite increases at first and then decreases.
【Fund】: 国家自然科学基金(51607165);; 中国工程物理研究院科学技术发展基金(2015B0402077)
【CateGory Index】: TB332
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