Lightweight flexible polyurethane/reduced ultralarge graphene oxide composite foams for electromagnetic interference shielding

Multifunctional flexible polyurethane (PU)/reduced ultralarge graphene oxide (rUL-GO) composite foams with low density in the range of ∼53–92 kg m −3 were fabricated through the in situ polymerization of PU in the presence of rUL-GO. The incorporation of 1 wt% rUL-GO gave the insular flexible PU com...

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Bibliographic Details
Published in:RSC advances 2016-01, Vol.6 (33), p.27517-27527
Main Authors: Gavgani, Jaber Nasrollah, Adelnia, Hossein, Zaarei, Davood, Moazzami Gudarzi, Mohsen
Format: Article
Language:English
Subjects:
Electromagnetic interference
Electromagnetic interference shielding
Foams
Graphene
Oxides
Polymer matrix composites
Polyurethane foam
Polyurethane resins
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Summary:Multifunctional flexible polyurethane (PU)/reduced ultralarge graphene oxide (rUL-GO) composite foams with low density in the range of ∼53–92 kg m −3 were fabricated through the in situ polymerization of PU in the presence of rUL-GO. The incorporation of 1 wt% rUL-GO gave the insular flexible PU composite foams a high electrical conductivity of 4.04 S m −1 , and an excellent electromagnetic interference (EMI) shielding efficiency of ∼253 dB (g −1 cm −3 ) at 8–12 GHz. Achieving such a high specific EMI shielding efficiency as well as a low percolation threshold, combined with the method of foam preparation, results in a uniform dispersion and very high aspect ratio (>20 000) for the rUL-GO nanosheets. Furthermore, by the introduction of rUL-GO, the Young’s modulus and tensile strength of the PU composite foams also improved significantly without reducing the flexibility. TGA experiments also indicated the enhanced thermal stability of the composite foams.
ISSN:2046-2069
2046-2069
DOI:10.1039/C5RA25374H