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Nickel-Schiff base decorated graphene for simultaneously enhancing the electroconductivity, fire resistance, and mechanical properties of polyurethane elastomer

Abstract

Excellent electroconductivity, fire resistance, and mechanical properties are several important indexes for electromagnetic shielding sealing materials. In this work, a novel functionalized graphene decorated with Nickel-Schiff base (rGO-Salen-Ni) was first synthesized via a chemical modification process, and applied in enhancing the mechanical properties, electroconductivity, and fire resistance of thermoplastic polyurethane elastomer (TPU). Experimental result illustrated that the rGO-Salen-Ni significantly improved the above vital properties of TPU. First, the tensile strength, elongation at break, and storage modulus of TPU containing only 1.5 wt% of rGO-Salen-Ni (TPU/rGO-Salen-Ni1.5) were respectively increased to 1.50 times, 1.58 times, and 2.17 times; second, the electrical conductibility of the TPU/rGO-Salen-Ni1.5 was increased by 5 orders of magnitude in comparison with that of pure TPU, up to 7.3×10-5 S/m; finally, the TPU/rGO-Salen-Ni1.5 displayed excellent flame retardancy, for instance, the peak of heat release rate, total heat release, and total smoke production were respectively decreased by 43%, 22%, and 28% compared with the corresponding value of pure TPU. The analysis on the enhancement in mechanical properties and electroconductivity of TPU/rGO-Salen-Ni revealed that the uniform dispersion of rGO-Salen-Ni, resulting from the incorporation of Nickel-Schiff base into the GO, was the leading reason for their improvements. The study on the flame-retardant mechanism demonstrated that more continuous and compact protective layer related to the Nickel-Schiff base played the key role in the excellent fire resistance of TPU/rGO-Salen-Ni. The rGO-Salen-Ni shows great potential application in electromagnetic shielding sealing materials.

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Publication details

The article was received on 07 Feb 2018, accepted on 03 Apr 2018 and first published on 03 Apr 2018


Article type: Paper
DOI: 10.1039/C8TA01287C
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Nickel-Schiff base decorated graphene for simultaneously enhancing the electroconductivity, fire resistance, and mechanical properties of polyurethane elastomer

    W. Wei, C. Deng, S. Huang, Y. Wei and Y. Wang, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA01287C

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