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Constructing nanopores in poly(oxymethylene)/multi-wall carbon nanotube nanocomposites via poly(l-lactide) assisting for improving electromagnetic interference shielding.
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2020-01-17 , DOI: 10.1016/j.jcis.2020.01.057
Jie Li 1 , Jia-Li Chen 1 , Xiao-Hong Tang 1 , Jie-Hua Cai 1 , Ji-Hong Liu 1 , Ming Wang 1
Affiliation  

Lightweight and high-performance conductive polymer composites (CPCs) have attracted much attention for electromagnetic interference (EMI) shielding. Herein, the porous structure was constructed in poly(oxymethylene)/multi-wall carbon nanotube (POM/MWCNT) nanocomposites via assisting by poly(l-lactide) (PLLA). First, the POM/PLLA/MWCNT (S-PMLNT) nanocomposites were obtained by melt mixing and compression molding. Second, the nanoporous POM/MWCNT (P-PMNT) nanocomposites were fabricated by selectively dissolving PLLA, solvent exchanging and freeze-drying. Because of well miscible between PLLA and POM, the homogeneous nanopores could be successfully fabricated in the P-PMNT composites by removing the PLLA phase. The multiple reflections and scattering of microwaves happened on the walls of these nanopores, which endowed the P-PMNT nanocomposites having higher EMI shielding effectiveness (SE) in comparison of the S-PMLNT nanocomposites, although the P-PMNT nanocomposites exhibited the lower electrical conductivity. For example, the S-PMLNT samples with 10 wt% MWCNTs showed an EMI SE of 48.1 dB and an electrical conductivity of 333 S/m, which changed to 58.6 dB in EMI SE and 125 S/m in electrical conductivity after removing PLLA phase. Furthermore, the P-PMNT10 nanocomposites had outstanding the EMI normal SE (SE/d) of 29.3 dB mm-1 and the EMI specific shielding effectiveness (SSE/d) of 344.4 dB cm2 g-1 because of their low density. In addition, the P-PMNT nanocomposites maintained high compression and tensile strength simultaneously.

中文翻译:

通过聚(l-丙交酯)在聚(甲醛)/多壁碳纳米管纳米复合材料中构建纳米孔,有助于改善电磁干扰屏蔽。

轻巧和高性能的导电聚合物复合材料(CPC)在电磁干扰(EMI)屏蔽方面引起了广泛关注。在此,借助于聚(1-丙交酯)(PLLA)的辅助,在聚(甲醛)/多壁碳纳米管(POM / MWCNT)纳米复合材料中构造了多孔结构。首先,通过熔融混合和压塑获得POM / PLLA / MWCNT(S-PMLNT)纳米复合材料。其次,通过选择性溶解PLLA,溶剂交换和冷冻干燥制备了纳米多孔POM / MWCNT(P-PMNT)纳米复合材料。由于PLLA和POM之间具有很好的可混溶性,因此可以通过去除PLLA相在P-PMNT复合材料中成功地制备均匀的纳米孔。这些纳米孔的壁上发生了微波的多次反射和散射,尽管P-PMNT纳米复合材料表现出较低的电导率,但是与S-PMLNT纳米复合材料相比,其赋予了P-PMNT纳米复合材料更高的EMI屏蔽效率(SE)。例如,具有10 wt%MWCNT的S-PMLNT样品显示EMI SE为48.1 dB,电导率为333 S / m,在去除PLLA相后,EMI SE为58.6 dB,电导率变为125 S / m 。此外,由于其低密度,P-PMNT10纳米复合材料具有29.3 dB mm-1的EMI正常SE(SE / d)和344.4 dB cm2 g-1的EMI特定屏蔽效率(SSE / d)。此外,P-PMNT纳米复合材料同时保持了高压缩强度和拉伸强度。尽管P-PMNT纳米复合材料表现出较低的电导率。例如,具有10 wt%MWCNT的S-PMLNT样品显示EMI SE为48.1 dB,电导率为333 S / m,在去除PLLA相后,EMI SE为58.6 dB,电导率变为125 S / m 。此外,由于其低密度,P-PMNT10纳米复合材料具有29.3 dB mm-1的EMI正常SE(SE / d)和344.4 dB cm2 g-1的EMI特定屏蔽效率(SSE / d)。此外,P-PMNT纳米复合材料同时保持了高压缩强度和拉伸强度。尽管P-PMNT纳米复合材料表现出较低的电导率。例如,具有10 wt%MWCNT的S-PMLNT样品显示EMI SE为48.1 dB,电导率为333 S / m,在去除PLLA相后,EMI SE为58.6 dB,电导率变为125 S / m 。此外,由于其低密度,P-PMNT10纳米复合材料具有29.3 dB mm-1的EMI正常SE(SE / d)和344.4 dB cm2 g-1的EMI特定屏蔽效率(SSE / d)。此外,P-PMNT纳米复合材料同时保持了高压缩强度和拉伸强度。去除PLLA相后,EMI SE为6 dB,电导率为125 S / m。此外,由于其低密度,P-PMNT10纳米复合材料具有29.3 dB mm-1的EMI正常SE(SE / d)和344.4 dB cm2 g-1的EMI特定屏蔽效率(SSE / d)。此外,P-PMNT纳米复合材料同时保持了高压缩强度和拉伸强度。去除PLLA相后,EMI SE为6 dB,电导率为125 S / m。此外,由于其低密度,P-PMNT10纳米复合材料具有29.3 dB mm-1的EMI正常SE(SE / d)和344.4 dB cm2 g-1的EMI特定屏蔽效率(SSE / d)。此外,P-PMNT纳米复合材料同时保持了高压缩强度和拉伸强度。
更新日期:2020-01-17
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