关键字：Electric conductivity of solids;Aliphatic compounds - Alumina - Aluminum oxide - Aspect ratio - Blending - Carrier mobility - Electric breakdown - Electric properties - Electric space charge - Electric variables measurement - Nanocomposites - Nanosheets - Polyethylenes

摘要：This paper describes the effects of &alpha;-Al<inf>2</inf>O<inf>3</inf> nanosheets on the direct current voltage breakdown strength and space charge accumulation in crosslinked polyethylene/&alpha;-Al<inf>2</inf>O<inf>3</inf> nanocomposites. The &alpha;-Al<inf>2</inf>O<inf>3</inf> nanosheets with a uniform size and high aspect ratio were synthesized, surface-modified, and characterized. The &alpha;-Al<inf>2</inf>O<inf>3</inf> nanosheets were uniformly distributed into a crosslinked polyethylene matrix by mechanical blending and hot-press crosslinking. Direct current breakdown testing, electrical conductivity tests, and measurements of space charge indicated that the addition of &alpha;-Al<inf>2</inf>O<inf>3</inf> nanosheets introduced a large number of deep traps, blocked the charge injection, and decreased the charge carrier mobility, thereby significantly reducing the conductivity (from 3.25 x 10^-13 S/m to 1.04 x 10^-13 S/m), improving the direct current breakdown strength (from 220 to 320 kV/mm) and suppressing the space charge accumulation in the crosslinked polyethylene matrix. Besides, the results of direct current breakdown testing and electrical conductivity tests also showed that the surface modification of &alpha;-Al<inf>2</inf>O<inf>3</inf> nanosheets effectively improved the direct current breakdown strength and reduced the conductivity of crosslinked polyethylene/&alpha;-Al<inf>2</inf>O<inf>3</inf> nanocomposites.<br/> &copy; 2020 by the authors.

卷号：13

期号：6

是否译文：否