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首页> 外文会议>International Conference of the Polymer Processing Society >AC Electrical Conductivity, Shielding Effectiveness and Viscoelastic Characteristics of Nanocomposites Based on RTV Silicon Rubber and Nano Graphite Sheets/Carbon Black Hybrid System
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AC Electrical Conductivity, Shielding Effectiveness and Viscoelastic Characteristics of Nanocomposites Based on RTV Silicon Rubber and Nano Graphite Sheets/Carbon Black Hybrid System

机译：基于RTV硅橡胶和纳米石墨板/炭黑杂交系统的纳米复合材料的AC电导率，屏蔽效果和粘弹性特性

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摘要

Highly flexible nanocomposites based on room temperature vulcanizing (RTV) silicon rubber, conductive nano system comprised of high structure carbon black (CB) and graphite nano plates (GNP) were fabricated by solution processing method. Electrical properties and EMI shielding effectiveness of nanocomposites generated by various ratios of CB/GNP were measured and compared with the binary nanocomposites based on SR/CB and SR/GNP. The composites prepared by SR/CB showed higher electrical conductivity and lower percolation threshold than SR/GNP counterparts. The electrical properties of the hybrid composites showed to be governed by the major filler phase. AC conductivity of all binary and ternary composites showed increasing by frequency below percolation threshold without plateau (non-ohmic conduction), whereas above percolation threshold AC conductivity showed plateau within low frequency region, but sudden increase within high frequency region indicating non-ohmic conductivity. The dielectric and electrical analysis suggested that above percolation threshold direct contact between filler particles plays the main mechanism for the electric charge current throughout SR phase for all nanocomposites. EMI shielding effectiveness measurement results within X-band frequency revealed that absorption loss is the dominant mechanism for the attenuation of the intensity of incident electromagnetic wave in all nanocomposites generated by SR/CB, SR/GN, and SR/CB/GN systems.
机译：通过溶液加工方法制造基于室温硫化（RTV）硅橡胶的高度柔性纳米复合材料，由高结构炭黑（Cb）和石墨纳米板（GNP）构成的导电纳米系统。测量由CB / GNP各种比率产生的纳米复合材料的电性能和EMI屏蔽效果，并与基于SR / Cb和Sr / GNP的二元纳米复合材料进行比较。通过SR / Cb制备的复合材料显示出比SR / GNP对应物更高的电导率和较低的渗透阈值。混合复合材料的电性能显示为主要填充阶段的控制。所有二进制和三元复合材料的AC电导率显示出不低于高原的渗透阈值的频率（非欧姆传导）的频率增加，而高于渗透阈值交流电导率在低频区域内显示平台，但在低频区域内突然增加，表示非欧姆电导率。电介质和电气分析表明，填充颗粒之间的上述渗透阈值直接接触在所有纳米复合材料中发挥在整个SR相的电荷电流的主机构。 EMI屏蔽有效性测量结果导致X波段频率内显示出吸收损失是SR / Cb，Sr / Gn和Sr / Cb / Gn系统产生的所有纳米复合材料中入射电磁波强度的主导机制。

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