2014
DOI: 10.1039/c3ra45607b
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Influence of carbon nanoparticles on the polymerization and EMI shielding properties of PU nanocomposite foams

Abstract: Rigid polyurethane (PU) nanocomposite foams filled with multi-walled carbon nanotubes (MWCNTs), functionalized MWCNTs (f-MWCNTs) and functionalized graphene sheets (FGS) were synthesized by reactive foaming to obtain electromagnetic interference (EMI) shielding materials. Our study indicates that the electrical properties of rigid PU nanocomposite foams are strongly dependent on the foaming evolution, cellular structure and density of these materials, which are themself influenced by the morphology, aspect rat… Show more

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Cited by 58 publications
(32 citation statements)
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“…[4][5][6] Electrically conductive polymer composites made of conductive nanoparticles dispersed in polymer matrixes are excellent candidates for preparing lightweight EMI shielding materials because they exhibit low density, high processing ability, tunable conductivity, and resistance to corrosion compared to metal-based EMI shielding materials. 20 It has been demonstrated, at the same carbon-based nanoller loading, the composites lled with high aspect ratio CNTs displayed higher EMI shielding effectiveness (SE) than composites lled with low aspect nanollers such as CNFs at 8-12 GHz, [21][22][23] which played an important role in designing composites for high-performance EMI shielding. 20 It has been demonstrated, at the same carbon-based nanoller loading, the composites lled with high aspect ratio CNTs displayed higher EMI shielding effectiveness (SE) than composites lled with low aspect nanollers such as CNFs at 8-12 GHz, [21][22][23] which played an important role in designing composites for high-performance EMI shielding.…”
Section: Introductionmentioning
confidence: 99%
“…[4][5][6] Electrically conductive polymer composites made of conductive nanoparticles dispersed in polymer matrixes are excellent candidates for preparing lightweight EMI shielding materials because they exhibit low density, high processing ability, tunable conductivity, and resistance to corrosion compared to metal-based EMI shielding materials. 20 It has been demonstrated, at the same carbon-based nanoller loading, the composites lled with high aspect ratio CNTs displayed higher EMI shielding effectiveness (SE) than composites lled with low aspect nanollers such as CNFs at 8-12 GHz, [21][22][23] which played an important role in designing composites for high-performance EMI shielding. 20 It has been demonstrated, at the same carbon-based nanoller loading, the composites lled with high aspect ratio CNTs displayed higher EMI shielding effectiveness (SE) than composites lled with low aspect nanollers such as CNFs at 8-12 GHz, [21][22][23] which played an important role in designing composites for high-performance EMI shielding.…”
Section: Introductionmentioning
confidence: 99%
“…The finally achieved conductivity of the nanocomposite materials depends on resistivity of the matrix materials, functional fillers, and preparation technologies, especially, several parameters such as cell properties, nucleation density, polymer viscosity, MWCNT‐OH dispersion, and mechanisms of electrical conduction. And most of the parameters are complexly interdependent (Bernal et al, ; Nayak et al, ). In our case, the same preparation process is used, and the similar physical and chemical properties of the final products of the neat BioPU foam and the composite BioPU foams were observed, the effect of the amount of conductive fillers on the DC volume resistivity of the prepared BioPU foam samples is mainly discussed.…”
Section: Resultsmentioning
confidence: 99%
“…Homogeneous dispersion of incorporated fillers, as well as strong interactions between composite fillers and polymer matrix can be attained in this way. PGNs as EMI shields made in this way mainly concentrate on epoxy/graphene [63], PANI/graphene [64], PANI/graphene@Fe 3 O 4 [65], and polyurethane (PU)/graphene [66]. The decrease of the polymerization rate at the later stages of polymerization is its drawback [67].…”
Section: In Situ Polymerizationmentioning
confidence: 98%
“…In order to improve the dispersibility of GNSs in water or organic solvents, different sorts of surfactants have been used in the fabrication of PGNs [66,79,80]. Ma et al, for instance, used a cationic surfactant: stearyl trimethyl ammonium chloride (STAC) to produce the STAC-absorbed-graphene nanosheets (S-GNS), effectively preventing the aggregation and restacking of GNSs by…”
Section: Concentration Dispersion and Conductivity Of Graphenementioning
confidence: 99%