Improvement of the flame retardancy of wood-fibre/polypropylene composites with ideal mechanical properties by a novel intumescent flame retardant system
作者：Ya-Hui Guan, Wang Liao,* Zhao-Zan Xu, Ming-Jun Chen, Jian-Qian Huang and Yu-Zhong Wang*
關(guān)鍵字：wood fiber, polymer-matrix composites (PMCs), mechanical properties, polymeric flame retardant
論文來源：期刊
具體來源：RSC Advances
發(fā)表時(shí)間：2015年
Wood fiber (WF) reinforced polypropylene (PP) composite (WPC) is not easily flame-retarded as both wood fiber and PP are highly flammable and have different flame retardant mechanism. To improve the flame retardancy of this biocomposite, a novel intumescent flame retardant (IFR) system comprised of a new polymeric flame retardant, poly[N4-bis(ethylenediamino)-phenyl phosphonic-N2, N6-bis(ethylenediamino)-1,3,5 -triazine-N-phenyl phosphonate] (PTPA) and ammonium polyphosphate (APP) was used to prepare flame-retardant WPC. The addition of PTPA has a positive effect on the flexural properties and the Notched Izod impact strength of WF/PP composites, whereas adding APP alone has a negative effect. The flame-retardant WF/PP composites have a high limiting oxygen index of 31.5%, and can pass UL-94 V-0 rating for vertical burning test. The results of cone calorimetry show the heat release rate (HRR) and total heat release (THR) of the WF/PP composites with the addition of IFR are reduced comparing to the calculated value. The flame-retardant mechanism of WPC/IFR system was investigated by thermogravimetric analysis (TGA), Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS). The results indicate that PTPA/APP can catalyze the etherification, dehydration and char formation of WPC.