Synergistic effect of graphene/multiwalled carbon nanotube hybrid fillers on mechanical, electrical and EMI shielding properties of polycarbonate/ethylene methyl acrylate nanocomposites
Synergistic effect of graphene/multiwalled carbon nanotube hybrid fillers on mechanical, electrical and EMI shielding properties of polycarbonate/ethylene methyl acrylate nanocomposites
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DOI：
10.1016/j.compositesb.2018.10.009
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发表时间：
2019-02-15
影响因子：
13.1
通讯作者：
Sharma, D. K.
中科院分区：
文献类型：
--
作者：
Bagotia, Nisha;Choudhary, Veena;Sharma, D. K.
本文描述了使用石墨烯：多壁碳纳米管杂化填料以不同比例（1：1，1：3和3：1）通过熔融共混工艺制备聚碳酸酯/乙烯丙烯酸甲酯（95/5 w/w）纳米复合材料。研究了石墨烯/多壁碳纳米管（MWCNT）杂化填料对纳米复合材料的电学、力学、热学和电磁屏蔽性能的影响。用扫描电镜和透射电镜对复合材料的形貌进行了表征。具有IOphr混合填料加载量（石墨烯：MWCNT比率为1：3）的复合材料与相同加载量下基于石墨烯或MWCNT的复合材料相比显示出最高的拉伸强度和拉伸模量。最大电导率（1.91 × 10（-1）S/cm）也是在10 phr的混合填料（石墨烯：MWCNT的比例为1：3）的负载下实现的，这比在相同负载下单独使用任一种填料制备的复合材料更高。导电性的这种显著增强是在8.2-12.4 GHz（X波段）频率范围内获得高达-34 dB EMI屏蔽效果的原因。具有混合填料（石墨烯：MWCNT的比例为1：3）的复合材料的机械性能、电导率和EMI屏蔽的增加显示出当组合使用此类填料时的协同效应。
This paper describes the preparation of polycarbonate/ethylene methyl acrylate (95/5 w/w) nanocomposites using graphene: MWCNT hybrid filler in varying ratios (1:1, 1:3 and 3:1) by melt blending process. The effect of graphene/MWCNT hybrid filler on electrical, mechanical, thermal and electromagnetic interference shielding properties of nanocomposites was investigated. Morphology of these composites was characterized by scanning and transmission electron microscopy. Composites with 10 phr loading of hybrid filler (graphene: MWCNT ratio of 1:3) show the highest tensile strength and tensile modulus as compared to the composites based on graphene or MWCNT at the same loading. The maximum electrical conductivity (1.91 x 10(-1) S/cm) was also achieved at a loading of 10 phr of hybrid filler (graphene: MWCNT in the ratio of 1:3), which is higher as compared to the composite prepared using either of the filler alone at the same loading. This significant enhancement in electrical conductivity is responsible to attain up to -34 dB EMI shielding effectiveness in frequency range of 8.2-12.4 GHz (X-band). An increase in mechanical properties, electrical conductivity and EMI shielding for composites having hybrid filler (graphene: MWCNT in ratio 1:3) shows the synergistic effects when such fillers are used in combination.