Combination of fumed silica with carbon black for simultaneously improving the thermal stability, flame retardancy and mechanical properties of polyethylene
writer：9. Jiang Gong, Ran Niu, Nana Tian, Xuecheng Chen, Xin Wen, Jie Liu, Zhaoyan Sun, Ewa Mijowska, Tao T
keywords：flame retardancy, mechanical properties, polymer composites
source：期刊
specific source：polymer
Issue time：2014年
The combination of fumed silica (SiO2) with carbon black (CB) for improving
thermal stability, flame retardancy and mechanical properties of linear low density
polyethylene (LLDPE) was investigated. The temperature at the maximum weight
loss rate of LLDPE was dramatically increased by 92 oC, and the peak value of heat
release rate measured by cone calorimeter was significantly reduced by 80.7%. The
improved thermal stability and flame retardancy of LLDPE were partially attributed
to the formation of a percolated network structure in LLDPE matrix, and partially to
the accelerated oxidation crosslinking reaction of LLDPE or other radicals by CB and
SiO2. More importantly, although both SiO2 and CB were used without any
pre-treatment, ternary LLDPE nanocomposites showed much higher mechanical
properties compared to those of neat LLDPE. This was ascribed to good dispersions
of two kinds of nanoparticles and strong matrix-nanoparticle interfacial interactions
with LLDPE matrix.