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Influence of phosphorus‐grafted expandable graphite on the flame‐retardant property of UHMWPE composite
Author(s) -
Wang Huaming,
Cao Jingshi,
Cao Changlin,
Guo Yiyou,
Luo Fubin,
Qian Qingrong,
Huang Baoquan,
Xiao Liren,
Chen Qinghua
Publication year - 2019
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.4485
Subject(s) - fire retardant , limiting oxygen index , materials science , thermogravimetric analysis , x ray photoelectron spectroscopy , char , thermal stability , fourier transform infrared spectroscopy , composite number , composite material , graphite , polyethylene , nuclear chemistry , chemical engineering , polymer chemistry , pyrolysis , chemistry , engineering
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.