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首页> 外文期刊>Polymers for advanced technologies >Electrically conductive carbon nanofiber/polyethylene composite: effect of melt mixing conditions
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Electrically conductive carbon nanofiber/polyethylene composite: effect of melt mixing conditions

机译：导电碳纳米纤维/聚乙烯复合材料：熔融混合条件的影响

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摘要

The effect of melt mixing conditions on the morphological, rheological, electrical, electromagnetic interference (EMI) shielding effectiveness (SE), and tensile properties of 7.5 vol.% vapor grown carbon nanofiber (VGCNF)/polyethylene composites were investigated. 7.5 vol.% VGCNF was used because such loading is required to obtain a composite with satisfactory EMI SE. The composites were compounded by melt mixing and the parts were prepared by hot-compression molding. The dispersion and distribution of nanofibers were enhanced by increasing the mixing energy, i.e. mixing time and/or rotation speed. The influence of mixing energy on the electrical and EMI SE properties was found to be a function of rotation speed, i.e. shear stress. For composites compounded at 20 rpm, increasing the mixing energy from 70 to 2300 J/ml decreased the EMI SE from 29.5 to 23.9 dB. However, for composites prepared at 100 rpm, increasing the mixing energy from 600 to 1700 J/ml decreased the EMI SE from 25.4 to 18.6 dB. No considerable influence on the yield stress, Young's modulus, and strain at break were found for different processing conditions.
机译：研究了熔融混合条件对7.5 vol。％气相生长碳纳米纤维（VGCNF）/聚乙烯复合材料的形态，流变，电，电磁干扰（EMI）屏蔽效能（SE）和拉伸性能的影响。使用7.5体积％的VGCNF是因为需要这样的负载才能获得具有令人满意的EMI SE的复合材料。通过熔融混合将复合材料复合，并通过热压成型制备零件。通过增加混合能量，即混合时间和/或旋转速度，增强了纳米纤维的分散和分布。发现混合能量对电和EMI SE性能的影响是转速的函数，即剪切应力。对于以20 rpm混合的复合材料，将混合能量从70提高到2300 J / ml，将EMI SE从29.5降低到23.9 dB。但是，对于以100 rpm的速度制备的复合材料，将混合能从600提高至1700 J / ml，将EMI SE从25.4降低至18.6 dB。在不同的加工条件下，对屈服应力，杨氏模量和断裂应变没有显着影响。

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