A Novel Polyaniline-Coated Bagasse Fiber Composite with Core-Shell Heterostructure Provides Effective Electromagnetic Shielding Performance
A Novel Polyaniline-Coated Bagasse Fiber Composite with Core-Shell Heterostructure Provides Effective Electromagnetic Shielding Performance
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DOI：
10.1021/acsami.6b11989
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发表时间：
2017-01-11
影响因子：
9.5
通讯作者：
Cheng, Lele
中科院分区：
文献类型：
--
作者：
Zhang, Yang;Qiu, Munan;Cheng, Lele
提出了一种简便的方法，通过一步原位聚合，将苯胺均匀沉积在甘蔗渣纤维（BF）上，研究了其结构、电学和电磁性能之间的关系。扫描电镜图像证实，聚苯胺主要包覆在高炉表面，表明所制备的BF/聚苯胺复合材料以天然廉价的高炉为核心，以聚苯胺为外壳。傅里叶变换红外光谱表明BF与聚苯胺壳层之间存在明显的相互作用，并且在聚苯胺壳层中实现了高度掺杂。x射线衍射结果表明，聚苯胺壳的结晶得到了改善。从介电、常数、损耗正切和Cole-Cole图等方面分析了介质的介电特性。BF/PANI复合材料的电导率为2.01 +/- 0.29 S.cm(-1)，高于原始PANT的135 +/- 0.15 S.cm（-1）。BF/PANI复合材料的复介电常数、电磁干扰（EMI）、屏蔽效能（SE）值和衰减常数均大于原始PANI。对复合材料的电磁干扰屏蔽机理进行了实验和理论分析。在0.4 mm厚度处，以吸收为主的总电磁干扰SE为28.8 dB，表明该复合材料具有良好的电磁屏蔽作用。此外，详细比较了BF/PANI、脱掺杂BF/PANI复合材料的电屏蔽性能和EMI屏蔽性能。原始PANT表明BF/PANI复合材料电磁性能的增强是由于电导率和核壳结构的改善。因此，该复合材料作为高性能电磁屏蔽材料具有潜在的商业应用价值，也可作为导电填料赋予聚合物具有电磁屏蔽能力的聚合物。
A facile route was proposed to synthesize polyaniline (PANE) uniformly deposited on bagasse fiber (BF) via a one-step in situ polymerization of aniline in the dispersed 03 system of BF Correlations between the structural, electrical, and electromagnetic properties were extensively investigated. Scanning electron microscopy images confirm that the PANI was coated dominantly on the BF surface, indicating that the as-prepared BF/PANI composite adopted the natural and inexpensive BF as its core and the PANT as the shell. Fourier transform infrared spectra suggest significant interactions between the BF and PANI shell, and a high degree of doping in the PANT shell was achieved. X-ray diffraction results reveal that the crystallization of the PANI shell was improved. The dielectric behaviors are analyzed with respect to dielectric, constant, loss tangent, and Cole-Cole plots. The BF/PANI composite exhibits superior electrical conductivity (2.01 +/- 0.29 S.cm(-1)), which is higher than that of the pristine PANT with 135 +/- 0.15 S.cm(-1). The complex permittivity, electromagnetic interference (EMI), shielding effectiveness (SE) values, and attenuation constants of the BF/PANI composite were larger than those of the pristine PANI. The EMI shielding mechanisms of the composite were experimentally:and theoretically analyzed. The absorption-dominated total EMI SE of 28.8 dB at a thickness of 0.4 mm-indicates the usefulness of the composite for electromagnetic shielding. Moreover, detailed comparison of electrical and EMI shielding properties with-respect to the BF/PANI, dedoped BF/PANI composite, and. he pristine PANT indicate that the enhancement of electromagnetic properties for the BF/PANI composite was due to the improved conductivity and the core-shell architecture. Thus, the composite has potential commercial applications for high-performance electromagnetic shielding materials and also could be used as a conductive filler to endow polymers polymers with electromagnetic-shielding ability.