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Considerations of the ordered, or crystalline, domains have long dominated research to characterize and explain the properties of polyethylene. This perspective has naturally influenced conceptions about the material, the nomenclature used to describe it, and the techniques used to measure its properties.
DSC and CL measurements are shown to be potential tools for monitoring functional antioxidant activity in LDPE cable insulation. Data from the two procedures are consistent for unaged polyethylene samples. The results suggest that either method could be used to determine quantitatively the amount of functioning AD in the dielectric if it has no aging history.
The following conclusions can be drawn: 1. The study of void population, size, and mobility will help define mechanisms of electrical failure in polyethylene cable insulation. Structural models explaining the origin of voids in terms of spherulitic domains must be expanded to include nonspherulitic morphologies. 2. Sample preparation for SEM investigations is extremely important. The actions of any...
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