应用宽频介电谱研究氢氧化铝/环氧树脂复合材料的α和β松弛行为

Broadband dielectric spectroscopy on α and β relaxation of aluminum trihydroxide/epoxy composites

聚合物的松弛行为直接影响其使用范围。本文应用宽频介电谱技术研究了中心粒径为2μm的氢氧化铝(ATH)填料对环氧树脂复合材料α和β松弛过程的影响。宽频介电谱的测试频率范围为0.1 Hz^2 MHz,温度范围为-100~100℃。ATH填料与环氧树脂的质量比为0%、20%、40%、60%、80%和100%。结果表明:填料对复合材料的α松弛过程影响较小,Vogel温度随填料的增加先减小后增大;β松弛的表观活化能随填料的增加先增大后减小,当ATH填料质量比为40%时,β松弛的表观活化能达到最大值。

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.