Polymer dielectric composites, which possess high dielectric and loss suppression with excellent mechanical properties, are of crucial importance in practical applications. Herein, high‐density polyethylene/nitrile rubber/multiwalled carbon nanotube (HDPE/NBR/MWCNT) composites were fabricated by the dynamic vulcanization (DV) technique. The effect of DV on the structure and properties of HDPE/NBR/MWCNTs was systematically investigated. The results illustrate that the DV technique combines the advantages of the crosslinked phase and melt processability of thermoplastics. With the increase of dicumyl peroxide content, the dielectric permittivity and the mechanical properties clearly increase, due to a better compatibility and dispersibility achieved by DV. More importantly, a continuous decrease of dielectric loss and conductivity are observed with the increase of dicumyl peroxide content. These can probably be assigned to the combination of better dispersion and slower chain mobility of the NBR phase induced by crosslinking. © 2020 Society of Industrial Chemistry

中文翻译：

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通过动态硫化同时增强高密度聚乙烯/丁腈橡胶/多壁碳纳米管复合材料的介电和机械性能

聚合物介电复合材料具有高介电和损耗抑制能力，并具有出色的机械性能，在实际应用中至关重要。本文采用动态硫化技术制备了高密度聚乙烯/丁腈橡胶/多壁碳纳米管（HDPE / NBR / MWCNT）复合材料。系统研究了DV对HDPE / NBR / MWCNTs结构和性能的影响。结果表明，DV技术结合了交联相和热塑性塑料熔融加工性能的优点。随着过氧化二枯基含量的增加，由于DV具有更好的相容性和分散性，介电常数和机械性能明显提高。更重要的是，随着过氧化二枯基含量的增加，观察到介电损耗和电导率的连续降低。这些可能归因于交联引起的NBR相更好的分散性和较慢的链迁移率。©2020工业化学学会