Abstract
Sandwich structure can be induced to achieve excellent electromagnetic interference shielding effectiveness (EMI SE) as is well known. However, how to optimize the structure to achieve performance optimization is still a problem. Herein, a poly(phthalazinone etherketone)/multiwall carbon nanotube (PPEK/MWCNT) composite with homodisperse and high content (15 wt%) of MWCNT was prepared by a water induced phase separation process. A sandwich structure was designed by introducing a wave-transmitting layer between the PPEK/MWCNT composite films. The MWCNT loading of the shielding layer and the wave-transmitting layer thickness (d) were varied to systematically investigate their influence on shielding performance in the X-band (8.2–12.4 GHz). EMI SE shows strong d value dependence. When the shielding layer was fixed, EMI SE showed a trend of decreasing, rising, leveling off and then decreasing again with d value increasing. The d value in the leveling off stage is the best value for performance optimization. The best d value decreased with increasing MWCNT content of the shielding layer. An absorption dominated SE up to 65 dB and a high increment rate of 140% of SE were achieved by optimization of the d value and shielding layer.
Highlights
Nowadays, the abuse of electronic device causes serious electromagnetic pollution, which has become one of the serious pollutions coming just a er water pollution, air pollution and noise pollution
A poly(phthalazinone etherketone)/multiwall carbon nanotube (PPEK/MWCNT) composite with homodisperse and high content (15 wt%) of MWCNT was prepared by a water induced phase separation process
A sandwich structure was designed by introducing a wavetransmitting layer between the Poly(phthalazinone etherketone) (PPEK)/MWCNT composite films
Summary
Metal sheets and resin-based metal micro-nanoparticle composites have been widely used to process into highperformance EMI shielding materials because of their excellent re ection property. Besides the conventional metal-based EMI shielding materials, resin matrix composites containing carbon-based nano llers, carbon nanotube (CNT)[8,9,10] and graphene[11,12] have become the focus of research due to their advantages of light weight, excellent processability, resistance to corrosion, and broad absorption bandwidth.[13,14,15,16,17,18]. The twisty and noncoplanar structure of phthalazinone moieties of its molecular chain endows it a better solubility in chloroform and N-methylpyrrolidone (NMP) and some other organic solvents.[25,26] In view of its superior performance, PPEK can be processed and applied in a variety of elds as high performance plastic and composite. Anhydrous ethanol (AR), chloroform (AR) and 1-methyl-2-pyrrolidinone (NMP, AR) were purchased from LiaoDong Chemical Reagent (China)
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