Simultaneous enhancement of dielectric and mechanical properties of high‐density polyethylene/nitrile rubber/multiwalled carbon nanotube composites prepared by dynamic vulcanization

Abstract

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.

Effect of carbon black and chain extender on thermal, rheological and mechanical properties of fully biodegradable poly(butylene adipate‐co‐terephthalate)/poly(3‐hydroxybutyrate‐co‐4‐hydroxybutyrate) blends

“…17,18 As another strategy to improve the mechanical properties of the blends, filler particles have been added to take advantage of their inherent properties, in addition to the benefits of the polymer blends. 19,20 The mechanical, thermal and barrier properties, as well as the electrical conductivity of polymeric composites, will be markedly enhanced based on the inherent properties of the fillers. 21,22 Therefore, the addition of fillers in polymer blends has attracted widespread interest, and the resulting polymer composites have been used in many fields of application due to their chemical resistance, low density and cost compared to those of metals.…”

“…As another strategy to improve the mechanical properties of the blends, filler particles have been added to take advantage of their inherent properties, in addition to the benefits of the polymer blends 19,20 . The mechanical, thermal and barrier properties, as well as the electrical conductivity of polymeric composites, will be markedly enhanced based on the inherent properties of the fillers 21,22 .…”