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Preparation of dual-functionalized graphene oxide for the improvement of the thermal stability and flame-retardant property of polysiloxane foam

Abstract

Polysiloxane foam (PSF) is a foam material with outstanding performance. However, the limiting oxygen index (LOI) of pure PSF is only 22.0 vol%, which can be attributed to combustible materials. In this work, graphene oxide (GO) was functionalized with hexachlorocyclotriphosphazene (HCCP) and 3-aminopropyltriethoxy-silane (APTS). The introduction of the functionalized GO into the PSF matrix has significantly improved the dispersion and flame-retardant property of the final PSF composite. The char residue of PSF with 1.0 wt% functionalized GO content is 43.04%, which is considerably higher than that of pure PSF (23.18%). Furthermore, the Tmax of PSF with 5.0 wt% functionalized GO content has increased from 585.9 °C to 668.8 °C. The results of cone calorimetry test indicate that modification with functionalized GO prolongs the combustion of PSF composites. The LOI value of PSF with 5.0 wt% functionalized GO content has increased from 22.0% to 27.6%. In addition, the peak heat release rate, total heat release, and total smoke production of PSF with 5.0 wt% functionalized GO content have decreased by 49.2%, 14.5%, and 62.2% relative to those of pure PSF. These results can be ascribed to the barrier effect of GO, the condensed-phase and gas-phase mechanisms of HCCP, and the bonding effect of APTS.

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Publication details

The article was received on 16 May 2018, accepted on 12 Jul 2018 and first published on 13 Jul 2018


Article type: Paper
DOI: 10.1039/C8NJ02361A
Citation: New J. Chem., 2018, Accepted Manuscript
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    Preparation of dual-functionalized graphene oxide for the improvement of the thermal stability and flame-retardant property of polysiloxane foam

    T. Xu, C. Zhang, L. Qu, P. Li, X. Dai, Y. Sui, J. Gu and Y. Dou, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ02361A

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