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Improving the flame-retardant efficiency of aluminum hydroxide with fullerene for high-density polyethylene
作者:Pan YQ, Han LG, Guo ZH, Fang ZP
关键字:composites; flame retardance; mechanical properties; thermogravimetric analysis (TGA)
论文来源:期刊
具体来源:Journal of Applied Polymer Science,2017, 134(9): 44551
发表时间:2017年

The influence of fullerene (C-60) on the flame retardancy and thermal

stability of high-density polyethylene (HDPE)/aluminum hydroxide (ATH)

composites was studied. After the addition of three portions of C-60 to

an HDPE-ATH (mass ratio=100:120) composite, a V-0 rating in the UL-94

vertical combustion test was achieved, and the limiting oxygen index

increased by about 2%. The results of cone testing also showed that the

addition of C-60 effectively extended the time to ignition and the time

to maximum heat-release rate while cutting down the peak heat-release

rate. Thus, fewer flame retardants were needed to achieve a satisfactory

flame retardance. Consequently, the adverse effects on the mechanical

properties because of the high level of flame-retardant loading was

reduced, as evidenced by the obvious enhancements in the tensile

strength, elongation at break, and flexural strength. Electron spin

resonance spectroscopy proved that C-60 was an efficient free-radical

scavenger toward HO center dot radicals. Thermogravimetric analysis

coupled to Fourier transform infrared spectroscopy demonstrated that in

both N-2 and air atmospheres, C-60 increased the onset temperature of

the matrix by about 10 degrees C because of its enormous capacity to

absorb free radicals evolved from the degradation of the matrix to form

crosslinked network, which was covered by aluminum oxide.