抄録
In this work, the effect of blend on physical and electrical properties of low-density polyethylene has been investigated. The two kinds of low-density polyethylene (LDPE) whose densities were evaluated to be 0.9179g/cm' and 0.9192g/cm', respectively, were used and blended according to the different blend ratio. The five kinds of specimens were classified according to the blend ratio which was determined by the weight percentage (wt%) of the LDPE with 0.9192g/cm' to the total weight. In the X-ray diffraction patterns, two peaks appear at 2θ=21.4° and 36.2°. In the case of the (020) plane in the diffraction peak at 2θ=36.2°, the crystal size is enlarged according to blend up to the blend ratio of 50wt%. From these results, it is found that the crystal size which is perpendicular to the (020) plane has the largest one at the blend ratio of 50wt%. The blended LDPE of 50wt% shows the lowest impulse breakdown strength, Folmp at 30°C. However, the Folmp of the blended LDPE of 50wt% is higher than that of original LDPE-A and LDPE-B. The blended LDPE of 50wt% has the highest Folmp at 90°C. It seems that the Folmp is associated with the changes of crystal size. The DC breakdown strength, Fmx, of the blended LDPE little depends on the blend ratio at all temperature.
