Abstract
In this paper, a novel hybrid organic–inorganic mesoporous silica was synthesized through co-condensation of vinyltriethoxysilane (VTES) and tetraethyl orthosilicate (TEOS) in the presence of poly(ethylene glycol)-B-poly(propylene glycol)-B-poly(ethylene glycol) (P123) surfactants, followed by DOPO modification via the reaction between vinyl groups and P–H bond in DOPO. The mesoscopic order and pore structure of the hybrid mesoporous silica was characterized by Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), X-ray diffraction (XRD) and N2 isothermal sorption. The effect of DOPO-grafted hybrid mesoporous silica (DM) and triphenyl phosphate (TPP) on the fire retardancy in polycarbonate (PC)/acrylonitrile-butadiene-styrene (ABS) was examined by limiting oxygen index (LOI), UL-94 test, thermalgravity analysis (TGA) and cone calorimeter. Composite PC/ABS with loading of 2 wt% DM and 6 wt% TPP reached LOI value of 28% and V0 rating in UL-94 test. Present high residual weight in TGA and low heat release rate (HRR) in the cone calorimeter. It also indicated that DM is a synergistic agent with TPP, which improved the thermal stability and promoted the system giving dense char layer at high temperature.
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