The thermal stability and flammability of expandable graphite filled polypropylene/thermoplastic polyurethane blends
Polypropylene/thermoplastic polyurethane (PP/TPU) blends filled with two different particle sizes (45 and 150 m) of expandable graphite (EG) were prepared by melt-blending.Thermogravimetric analysis (TGA) was carried out to explain the effect of EG on the thermal stability of PP/TPU blends.In addition,the fire behavior of PP/TPU and PP/TPU/EG was investigated by a cone calorimeter.The char morphology and carbonation of the above systems were also characterized.The experimental results indicated that intumescent EG significantly enhanced the thermal stability and fire resistance of these blends.With the smaller particle size of EG,the thermal stability and flame retardancy were greatly improved.The results from TGA and cone calorimeter demonstrated that the addition of EG could retard the degradation of the polymer materials above the temperature of 500 ℃ by promoting the formation of a compact char layer.This char layer prevented further degradation of the polymer matrix and protected it effectively from heat penetrating inside,resulting in lower weight loss rate and better flame retarded performances.
Expandable graphite Flame retardancy Thermal properties Flammability
Xin Ning Yang Xu Man Chen Xiaolang Chen Le Yang Xiaojin Bo Zining Chen Zhidan Sun Yonghong Ma Jun Qin Jie Yu Zhibin Zhang
Key Laboratory of Advanced Materials Technology Ministry of Education,School of Materials Science an School of Life Science and Engineering,Southwest Jiaotong University,Chengdu 610031,China National Engineering Research Center for Compounding and Modification of Polymer Materials,Guiyang 5
国内会议
长沙
英文
388-397
2013-10-01（万方平台首次上网日期，不代表论文的发表时间）