INFLUENCE OF CHEMICAL CROSS-LINKING ON THE OVERVOLTAGE POSITIVE TEMPERATURE COEFFICIENT OFLINEAR LOW DENSITY POLYETHYLENE/CARBONBLACK/ALUMINUM HYDROXIDE NANO COMPOSITES

摘要

The effect of cross-linking of blends on the stability of positive temperature coefficient (PTC) and theelimination of negative temperature coefficient (NTC) were investigated. Linear low density polyethylene(LLDPE) was chemically cross-linking with various amounts of dicumyl peroxide (DCP). The resulting ofcross-linking structure of composites was analyzed by gel content, differential scanning calorimetry(DSC), and dynamic mechanical analysis (DMA). By the effect of DCP, not only a high PTC intensityappeared, but also was the NTC effect of the composite eliminated. The PTC intensity reached sixorders of magnitude for the LLDPE/DCP(0.10 wt%)/CB/AI(OH)_3composite, and successfully passed thetest of over-voltage resistance.