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首页> 外文期刊>Journal of Applied Polymer Science >New PTCR Thermistors, Switching Current, and Electromagnetic Shielding Effectiveness from Nanosized Vanadium Sesquioxides Ceramic Reinforced Epoxy Resin Nanocomposites
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New PTCR Thermistors, Switching Current, and Electromagnetic Shielding Effectiveness from Nanosized Vanadium Sesquioxides Ceramic Reinforced Epoxy Resin Nanocomposites

机译：纳米五氧化二钒陶瓷增强环氧树脂纳米复合材料的新型PTCR热敏电阻，开关电流和电磁屏蔽效果

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A new polymer nanocomposites of an ep-oxy resin matrix with randomly dispersed nano-vanadiumsesquioxides (V203) in various amounts were prepared.The structure of the nanocomposites were characterizedby scanning and transmission electron microscopy (SEMand TEM), X-ray diffraction, hardness, packing factor,extent of filler reinforcement, glass transition temperature,and sound velocity. The percolation threshold in the con-ductivity of the "composites is lesser than 8 wt % and thedielectric constant can reach as high as 103. The resistiv-ity—temperature curve of the composites shows a positivetemperature coefficient (PTC) effect. The thermal stabilityof the composites was examined in terms of thermal gra-vimetry and differential scanning calorimetry (TG andDTA) and isothermal resistivity-time check. Because of theinterfacial interaction among filler particles and the epoxymatrix, the nanocomposites exhibit higher thermal stabil- ity. The current-voltage-temperature curves behave asswitching current. The temperature increases linearly withthe applied voltage which makes this PTC nanocompositesvery useful for temperature probe. Finally, electromagneticinterference shielding effectiveness (SE) values have beencalculated and measured for the nanocomposites in thefrequency range 1-12 GHz. It is found that the SE proper-ties of the nanocomposite improve with increase in wt of V203. A maximum SE of 42 dB for V20 sample at12 GHz has been achieved. These nanocomposites arepotentially useful in suppression of electromagnetic inter-ference and reduction of radar signature.
机译：制备了一种新的环氧树脂基聚合物纳米复合材料，该复合材料具有各种数量的无规分散的纳米钒倍半氧化物（V203），通过扫描和透射电子显微镜（SEMand TEM），X射线衍射，硬度，填充系数，填料增强程度，玻璃化转变温度和声速。复合材料的电导率渗透阈值小于8 wt％，介电常数可高达103。复合材料的电阻率-温度曲线显示出正温度系数（PTC）效应。通过热重，差示扫描量热法（TG和DTA）以及等温电阻率-时间检查对复合材料进行了研究，由于填料颗粒与环氧基质之间的界面相互作用，纳米复合材料表现出更高的热稳定性。 -温度曲线表现为开关电流，温度随施加的电压线性增加，这使得该PTC纳米复合材料非常适用于温度探测器，最后，计算并测量了1-12 GHz频率范围内的纳米复合材料的电磁干扰屏蔽效率（SE）值。发现随着重量的增加，纳米复合材料的SE性质得到改善V203。对于12 GHz的V20样本，最大SE为42 dB。这些纳米复合材料潜在地可用于抑制电磁干扰和减少雷达信号。

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