writer：Yan HQ, Wang HQ, Fang ZP*
keywords：Ramie, benzoxazine resin, laminates, Flame retardancy
source：期刊
specific source：Ind. Eng. Chem. Res., 2014.12, 53: 19961-19969
Issue time：2014年
Flame retardant ramie/benzoxazine resin laminates were prepared and modified by ammonium polyphosphate (APP) and a nitrogen-phosphorous flame retardant (NEWRAY911). The results showed that the limiting oxygen index (LOI) values of the ramie/benzoxazine laminates could be ameliorated by the addition of APP, but did not achieve V0 level in UL94 test. Their mechanical strengths were also partially damaged. To improve the flame retardancy and reduce the mechanical damage to laminates, ramie fabric was modified by NEWRAY911 before compounding. The LOI value of the laminate made by flame retardant ramie fabric could be increased to 44.8%, and the laminates achieved V0 level in UL94 test. Compared to the unmodified laminates, the flame retarding modification of the fabric helped to improve the mechanical properties of laminates. The mechanism of flame retardancy of these laminates was investigated further by thermogravimetric analysis coupled with infrared spectroscopy, microscale combustion calorimetry measurements and scanning electron microscopy.