期刊
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
卷 59, 期 34, 页码 15233-15241出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.0c01766
关键词
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资金
- National Natural Science Foundation of China [51903002]
- Hefei Key Technology Major RD Project [J2019G19]
- Anhui Provincial Science and Technology Major Project, China [17030901074]
- Natural Science Foundation of Anhui Education Department [KJ2019A0774]
Polyurethane/multiwalled carbon nanotube (PU/MWCNT) composite foams containing MWCNTs with long length (MWCNT-L and Ni MWCNT-L) and MWCNTs with short length (MWCNT-S) were prepared using an environmentally friendly water-blown method. The influence of different MWCNTs on the foaming process, morphologies, electrical conductivity, and mechanical and electromagnetic interference (EMI) shielding performances has been studied. The PU foams with MWCNT-L and MWCNT-S hybrid fillers (PU/MWCNT-L-S) display a more uniform cell structure compared with PU/MWCNT-L foams at the same filler loading because the short rod of MWCNT-S with mechanical sensitivity can help MWCNT-L eliminate the physical barrier during the foaming process. Conductance, polarization, and magnetic losses in PU/Nip-2L-CNT-2L-4S foam can scatter and reflect electromagnetic waves inside the cellular microstructure and eventually transform into heat in the conductive networks. PU/Nip-2L-CNT-2L-4S exhibited a density of 0.30 g/cm(3) and excellent specific EMI shielding efficiency of 102.7 dB/(g/cm(3)) over the X-band.
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