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首页> 外文期刊>ACS applied materials & interfaces >Lightweight Polypropylene/Stainless-Steel Fiber Composite Foams with Low Percolation for Efficient Electromagnetic Interference Shielding
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Lightweight Polypropylene/Stainless-Steel Fiber Composite Foams with Low Percolation for Efficient Electromagnetic Interference Shielding

机译：轻量级聚丙烯/不锈钢纤维复合泡沫，具有低渗透性的高效电磁干扰屏蔽

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摘要

Lightweight polypropylene/stainless-steel fiber (PP-SSF) composites with 15-35% density reduction were fabricated using foam injection molding. The electrical percolation threshold, through-plane electrical conductivity, and electromagnetic interference (EMI) shielding effectiveness (SE) of the PP-SSF composite foams were characterized and compared against the solid counterparts. With 3 wt % CO2 dissolved in PP as a temporary plasticizer and lubricant, the fiber breakage was significantly decreased during injection molding, and well-dispersed fibers with unprecedentedly large aspect ratios of over 100 were achieved. The percolation threshold was dramatically decreased from 0.85 to 0.21 vol %, accounting for 75% reduction, which is highly superior, compared to 28% reduction of the previous PP-carbon fiber composite foam.1 Unlike the case of carbon fiber,1 SSFs were much longer than the cell size, and the percolation threshold reduction of PP-SSF composite foams was thus primarily governed by the decreased fiber breakage instead of fiber orientation. The specific EMI SE was also significantly enhanced. A maximum specific EMI SE of 75 dB·g~(-1)cm~3 was achieved in PP-1.1 vol % SSF composite foams, which was much higher than that of the solid counterpart. Also, the relationships between the microstructure and properties were discussed. The mechanism of EMI shielding enhancement was also studied.
机译：使用泡沫注射成型制造轻量级聚丙烯/不锈钢纤维（PP-SSF）合成具有15-35％密度的密度减少。 PP-SSF复合泡沫的电渗透阈值，直平面导电性和电磁干扰（EMI）屏蔽效果（EMI）的特征在于和与固体对应物进行比较。用3wt％CO 2溶于pp作为临时增塑剂和润滑剂，在注射成型期间纤维断裂显着降低，并且达到了前所未有的大宽高比的良好分散的纤维。渗透阈值从0.85到0.21体积％显着降低，占75％的减少，比以前的PP - 碳纤维复合泡沫减少28％，与碳纤维的情况不同，1 SSF因此，比细胞尺寸长得多，并且PP-SSF复合泡沫的渗透阈值降低主要由降低的纤维断裂而不是纤维取向来控制。特定的EMI SE也显着增强。在PP-1.1 Vol％SSF复合泡沫中实现了75dB·G〜（-1）cm〜3的最大特异性EMI SE，其远高于固体对应物的泡沫。而且，讨论了微观结构和性质之间的关系。还研究了EMI屏蔽增强的机制。

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