g) were measured for composites of epoxy resin and MgO fillers with various sizes in a wide tempera'/> Effects of addition of MgO fillers with various sizes and co-addition of nano-sized SiO2 fillers on the dielectric properties of epoxy resin
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Effects of addition of MgO fillers with various sizes and co-addition of nano-sized SiO2 fillers on the dielectric properties of epoxy resin

机译：添加各种尺寸的MgO填料和共添加纳米SiO2填料对环氧树脂介电性能的影响

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Complex permittivity (ε r' and ε r”)conductivity (σ), and glass transition temperature (Tg) were measured for composites of epoxy resin and MgO fillers with various sizes in a wide temperature and frequency range. The effect of co-addition of nano-sized SiO2 was also examined. It has become clean that Tg decreases by the addition of MgO fillers, and its decrement becomes more with a decrease in filler size. Moreover, Tg decreases if the silica nanofillers are co-added. However, all the three important parameters for electrical insulation ability of polymers, namely εr', εr”, and σ, decrease with the decrease in size of MgO fillers or by the addition of silica nanofillers at high temperatures and low frequencies. This is a very astonishing result, since it seems reasonable that a polymer with a high Tg should have a better insulating ability. Probably, the above-mentioned results indicate that the charge transport becomes more difficult, presumably resulting from the suppression of molecular motion with the decrease in size of MgO fillers and by the co-addition of SiO2 nanofillers. This indicates that the suppression of molecular motion becomes very strong if the filler size is small, making the carrier transport difficult even in polymers with low Tg.
机译：在宽的温度和频率下，测量了各种尺寸的环氧树脂和MgO填料的复合材料的复介电常数（εr'和εr“）电导率（σ）和玻璃化转变温度（T g ）范围。还研究了纳米SiO 2 共添加的影响。通过添加MgO填料可以降低T g ，并且随着填料尺寸的减小其减量也变得越来越大，这已经变得很干净了。此外，如果共添加二氧化硅纳米填料，T g 降低。但是，随着MgO填料尺寸的减小，聚合物的电绝缘性能的三个重要参数ε r '，ε r ”和σ均减小。通过在高温和低频下添加二氧化硅纳米填料。这是一个非常令人惊讶的结果，因为高T g 的聚合物应该具有更好的绝缘能力似乎是合理的。上述结果可能表明电荷传输变得更加困难，这可能是由于随着MgO填料尺寸的减小以及SiO 2 纳米填料的共添加而抑制了分子​​运动。这表明，如果填料尺寸小，则对分子运动的抑制作用将变得非常强，即使在T g 低的聚合物中，也难以进行载流子的输送。

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