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Influence of phosphorus?grafted expandable graphite on the flame?retardant property of UHMWPE composite

In this paper, an efficient flame retardant, 9,10?dihydro?9?oxa?10?phosphaphenanthrene?10?oxide (DOPO) was covalently grafted onto the surface of expandable graphite (EG). The resultant DOPO?grafted expandable graphite (EG?g?DOPO) was characterized by Fourier transform infrared spectroscopy, energy dispersive spectroscopy, and X?ray photoelectron spectroscopy (XPS), respectively. The thermal stability of EG?g?DOPO was also evaluated by thermogravimetric analysis (TGA). Moreover, a series of flame?retardant ultra?high?molecular?weight polyethylene (UHMWPE) composites with various concentrations of EG?g?DOPO were prepared and evaluated. The results show that the UHMWPE composite with 20wt% EG?g?DOPO possesses a satisfactory UL?94 flame?retardant grade (V?0) and a high limiting oxygen index (30.6%). The residual char of the UHMWPE composite with higher EG?g?DOPO concentration shows more compact and integrated, providing an efficient barrier for heat release.

» Author: Huaming Wang, Jingshi Cao, Changlin Cao, Yiyou Guo, Fubin Luo, Qingrong Qian, Baoquan Huang, Liren Xiao, Qinghua Chen

» Reference: doi:10.1002/pat.4485

» Publication Date: 04/11/2018

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This project has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement n [310187].