Dielectric Properties and Crystalline Morphology of Low Density Polyethylene Blended with Metallocene Catalyzed Polyethylene

Dielectric properties of low-density polyethylene (LDPE) blended with metallocene catalyzed polyethylene (MPE) to 1, 3, 5 wt% of the latter are reported. It was found that the 1 wt% MPE blend had the lowest volume resistivity, the highest direct current (DC) breakdown strength and the least accumula...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2008-04, Vol.15 (2), p.319-326
Main Authors: Wang, X., He, H.Q., Tu, D.M., Lei, C., Du, Q.G.
Format: Article
Language:English
Subjects:
Blends
Calorimetry
Conductivity
Crystal defects
Crystal structure
Crystallization
Dielectric properties
Dielectrics
Direct current
Electric breakdown
Impurities
Morphology
Polyethylene
Polyethylenes
Space charge
Spherulites
X-ray diffraction
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Summary:Dielectric properties of low-density polyethylene (LDPE) blended with metallocene catalyzed polyethylene (MPE) to 1, 3, 5 wt% of the latter are reported. It was found that the 1 wt% MPE blend had the lowest volume resistivity, the highest direct current (DC) breakdown strength and the least accumulated space charge. The crystalline morphology of the blends was studied through differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD) and small-angle light scattering (SALS) measurements. It was found that blending increased the percentage crystallinity, decreased the spherulite size and caused the formation of imperfect spherulites, i.e. spherulites containing defects and impurities in their crystalline phases, and thus fewer impurities and defects on their boundaries. The improvement in dielectric properties of the blends, especially the 1 wt% MPE blend, is attributed to the increase in crystallinity and the formation of imperfect spherulites.
ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2008.4483448