부산대학교 도서관

To improve flame retardant properties of polypropylene,the brominated epoxy resin (BEO) and nano-Sb2O3 were added into polypropylene by using a high energy ball milling technique. Flame retardant properties of polypropylene composites were evaluated by UL94 vertical combustion tests and limit oxygen index (LOI). The surface morphology of combustion products of composites was characterized by scanning electron microscopy(SEM) and the flame-retardant mechanism of flame retardant additives acting on the polymer matrix was studied by using thermo gravimetric analysis(TGA) and Fourier transform infrared (FT-IR) spectroscopy. The results show that the reaction between modified nano-Sb2O3 and BEO can prolong residence of the halogens in the combustion area, resulting in more hydroxyl and hydrogen radicals are replaced by the bromine radicals. When the content of modified nano-Sb2O3 is 7% (mass fraction, the same below) and that of BEO is 21%, the nano-Sb2O3/BEO/PP composite has excellent flame retardant performance with 28.6% of LOI value and V-0 of UL94 grade of vertical combustion.