Abstract Composites based on thermoplastic polyurethane [TPU] as matrix and polypyrrole/MWCNT (PCNT) as filler were prepared which inherit conducting, dielectric and magnetic attributes of polypyrrole/MWCNT [PCNT] filler. Polypyrrole/MWCNT was synthesized by in-situ polymerization of pyrrole monomer by chemical oxidative method in presence of MWCNT and fabrication of composites was carried out using solution blending method. The effect of polypyrrole /MWCNT content on electrical and microwave shielding efficiency of TPU was investigated to evaluate their potential as an effective EMI shield. These composites show absorption dominated total shielding effectiveness (SET) up to −46 dB in frequency range of 8.2–12.4 GHz (X-band) suggesting their utility for microwave absorbers. The EMI shielding result was also compared with polyurethane composites using neat polypyrrole (PPy) as filler. Polyurethane composites prepared using PCNT as filler showed much higher shielding efficiency (−46 dB using 40 wt. % PCNT filler) as compared to polyurethane composites having only PPy as filler (−18 dB using 40 wt. % PPy filler).

中文翻译：

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聚吡咯-多壁碳纳米管/聚氨酯复合材料的EMI屏蔽响应

摘要 制备了以热塑性聚氨酯[TPU]为基体、聚吡咯/多壁碳纳米管（PCNT）为填料的复合材料，该复合材料继承了聚吡咯/多壁碳纳米管[PCNT]填料的导电、介电和磁特性。在多壁碳纳米管的存在下，通过吡咯单体的原位聚合合成聚吡咯/多壁碳纳米管，并采用溶液共混法制备复合材料。研究了聚吡咯 /MWCNT 含量对 TPU 的电和微波屏蔽效率的影响，以评估它们作为有效 EMI 屏蔽的潜力。这些复合材料在 8.2-12.4 GHz（X 波段）的频率范围内显示出吸收占主导的总屏蔽效率 (SET) 高达 -46 dB，表明它们可用于微波吸收器。EMI 屏蔽结果还与使用纯聚吡咯 (PPy) 作为填料的聚氨酯复合材料进行了比较。与仅使用 PPy 作为填料的聚氨酯复合材料（使用 40 wt.% PPy 填料的 -18 dB）相比，使用 PCNT 作为填料制备的聚氨酯复合材料显示出更高的屏蔽效率（使用 40 wt.% PCNT 填料的 -46 dB）。