Intumescent mineral fire retardant systems in ethylene–vinyl acetate copolymer: Effect of silica particles on char cohesion
Intumescent mineral fire retardant systems in ethylene–vinyl acetate copolymer: Effect of silica particles on char cohesion
复制标题
DOI：
10.1016/j.polymdegradstab.2006.01.010
复制
发表时间：
2006-09
影响因子：
5.9
通讯作者：
F. Laoutid;L. Ferry;E. Leroy;J. L. Cuesta
中科院分区：
文献类型：
--
作者：
F. Laoutid;L. Ferry;E. Leroy;J. L. Cuesta
将不同物理性质（粒径、形貌和比表面积）的二氧化硅颗粒引入到填充有含氢氧化镁和有机改性蒙脱土的膨胀型矿物阻燃体系的乙烯-乙酸乙烯酯共聚物中。采用显微压痕法研究了白炭黑颗粒对泡沫燃烧残留物的粘结性和强度的影响，并对材料的火灾行为进行了表征。二氧化硅颗粒似乎是产生裂纹的缺陷，降低了残留物的强度。这种裂纹的产生与残余物的较低凝聚力有关，特别是对于高比表面积的二氧化硅颗粒。同时，高比表面积的二氧化硅的存在，尽管倾向于减少点燃时间，但由于在较高温度下更好的热稳定性，也提高了自熄能力，并降低了锥形量热计测试中的最大热释放速率。
Silica particles of different physical properties (particle size, morphology and specific surface area) were introduced into an ethylene–vinyl acetate copolymer filled with an intumescent mineral fire retardant system containing magnesium hydroxide and organo-modified montmorillonites. The effect of silica particles on the cohesion and strength of the foamed combustion residue was studied by micro-indentation, concurrently with the characterization of material's fire behavior. Silica particles seem to act as defects that generate cracks, decreasing the strength of the residue. This generation of cracks is connected to a lower cohesion of the residue, especially for silica particles of high specific surface area. In parallel, the presence of silica of high specific surface area, despite tending to decrease Time To Ignition, also improves self-extinguishing ability, thanks to a better thermal stability at higher temperatures, and reduces the maximum Heat Release Rate in cone calorimeter tests.