Abstract
A novel graphene-based phosphorus/silicon-containing flame retardant (GO-DOPO-V) was obtained via one-step reduction of graphene oxide (GO) with phosphorus/silicon-containing compound (DOPO-V). The Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectrometer (XPS), Atomic force microscope (AFM) and Thermogravimetric analysis (TGA) measurements were used to confirm the structure and morphology. After incorporation of 2 wt% GO-DOPO-V, the maximum decreases of 28.8% in peak heat release rate and 15.6% in total heat release are achieved compared to that of pure epoxy resin (EP). Furthermore, TGA and Scanning electron microscopy (SEM) measurement showed that GO-DOPO-V significantly enhanced the thermal stability and residual char strength of EP. Thus, attributed to the barrier effect of GO and phosphorus/silicon layer formation by DOPO-V, GO-DOPO-V was a high-efficient flame retardant to improve the combustion behavior of EP nanocomposite.
Highlights
Because of its excellent chemical resistance, mechanical properties and low shrinkage on cure, epoxy resin (EP) has been widely used in painting, adhesives and composite applications [1,2,3,4]
The flame retardancy of pure EP is always not good enough to fulfill the requirement in some applications, such as semiconductor encapsulants and printed circuit boards
A novel liquid compound (DOPO-V) containing DOPO and silicon was synthesized by allowing DOPO to react with vinyltrimethoxysilane (VTMS), and exhibited good compatibility with the epoxy matrix
Summary
Because of its excellent chemical resistance, mechanical properties and low shrinkage on cure, epoxy resin (EP) has been widely used in painting, adhesives and composite applications [1,2,3,4]. The flame retardancy of pure EP is always not good enough to fulfill the requirement in some applications, such as semiconductor encapsulants and printed circuit boards. Many approaches have been developed to obtain halogen-free flame-retardant EP [5,6,7,8,9,10]. Phosphorus-containing compounds are one of the most promising halogen-free flame retardants, among which 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO). Is a kind of environmentally-friendly flame retardant that has high thermal stability, and good oxidation and water resistance [11,12,13]. A novel liquid compound (DOPO-V) containing DOPO and silicon was synthesized by allowing DOPO to react with vinyltrimethoxysilane (VTMS), and exhibited good compatibility with the epoxy matrix. A relatively high loading (10 wt%) was usually needed to achieve a good flame-retardant effect [14,15,16,17]
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