Temasek Laboratories, Nanyang Technological University , 50 Nanyang Drive, 637553, Singapore.
School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue, 639798, Singapore.
ACS Appl Mater Interfaces. 2016 Mar 23;8(11):7422-30. doi: 10.1021/acsami.5b12072. Epub 2016 Mar 11.
Electromagnetic interference (EMI) performance materials are urgently needed to relieve the increasing stress over electromagnetic pollution problems arising from the growing demand for electronic and electrical devices. In this work, a novel ultralight (0.15 g/cm(3)) carbon foam was prepared by direct carbonization of phthalonitrile (PN)-based polymer foam aiming to simultaneously achieve high EMI shielding effectiveness (SE) and deliver effective weight reduction without detrimental reduction of the mechanical properties. The carbon foam prepared by this method had specific compressive strength of ∼6.0 MPa·cm(3)/g. High EMI SE of ∼51.2 dB was achieved, contributed by its intrinsic nitrogen-containing structure (3.3 wt% of nitrogen atoms). The primary EMI shielding mechanism of such carbon foam was determined to be absorption. Moreover, the carbon foams showed excellent specific EMI SE of 341.1 dB·cm(3)/g, which was at least 2 times higher than most of the reported material. The remarkable EMI shielding performance combined with high specific compressive strength indicated that the carbon foam could be considered as a low-density and high-performance EMI shielding material for use in areas where mechanical integrity is desired.
电磁干扰 (EMI) 性能材料对于缓解日益增长的电子和电气设备需求所带来的电磁污染问题的压力非常重要。在这项工作中，通过直接碳化苯并噁嗪（PN）基聚合物泡沫制备了一种新型超轻（0.15 g/cm(3)）的碳泡沫，旨在同时实现高 EMI 屏蔽效能 (SE) 并减轻重量，而不会对机械性能产生不利影响。该方法制备的碳泡沫的比压缩强度约为 6.0 MPa·cm(3)/g。由于其内在的含氮结构（3.3 wt% 的氮原子），实现了高达 ∼51.2 dB 的高 EMI SE。这种碳泡沫的主要 EMI 屏蔽机制被确定为吸收。此外，该碳泡沫表现出优异的特定 EMI SE 值 341.1 dB·cm(3)/g，至少是大多数报道材料的 2 倍以上。显著的 EMI 屏蔽性能结合高比压缩强度表明，该碳泡沫可用作低密度、高性能 EMI 屏蔽材料，适用于需要机械完整性的领域。
