Journal
POLYMERS FOR ADVANCED TECHNOLOGIES
Volume 30, Issue 3, Pages 493-503Publisher
WILEY
DOI: 10.1002/pat.4485
Keywords
composite; DOPO-grafted expandable graphite (EG-g-DOPO); flame-retardant property; UHMWPE
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Funding
- Industry-Academia-Research Program of Fujian [2017H6004]
- National Key R&D Program of China [2016YFB0302300]
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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 20 wt% 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.
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