Enhancements in damping properties and thermal conductivity of acrylonitrile‐butadiene rubber by using hindered phenol modified alumina

Abstract

Highly integrated electronic components used under mechanical vibration usually require the vibration‐reduction and heat‐dissipation protection from rubber composites. But it is still a challenge to simultaneously improving damping properties and thermal conductivity of rubber. Herein, hindered phenol modified alumina is prepared and filled to acrylonitrile‐butadiene rubber (NBR), leading to NBR/modified alumina composites with strong interfacial interaction. The composites exhibit superior damping properties. They have higher hysteresis ratio, damping coefficient, damping factor at 25°C, and effective damping temperature ranges than NBR and its unmodified alumina composites. The NBR/modified alumina composites also have higher thermal conductivity and lower relaxation rate than NBR and its alumina composites. The modification of alumina by the hindered phenol is an effective method for preparing NBR composites with extraordinary combination of good damping properties and high thermal conductivity. The composites have a great application potential for vibration‐reduction and heat‐dissipation protection of electronic components.

Co-modified h-BN was used to improve the mechanical properties and thermal conductivity of natural rubber

“…To improve the thermal conductivity of rubber, researchers usually add fillers with high thermal conductivity to the rubber matrix, such as alumina Al 2 O 3 , 9,10 graphene oxide GO, 11,12 aluminum nitride AlN 13,14 and boron nitride BN, 15,16 etc. h-BN is a ceramic-based thermally conductive particle, also known as “white graphite” because its structure and physicochemical properties are similar to graphite.…”

Modification of nitrile‐butadiene rubber surface by immersion into 1,1,2‐trifluoro‐1,2,2‐trichlor‐ethane and its physio‐chemical properties

“…89 Furthermore, certain approaches are designed to modify filler surfaces for better compatibility with NBR in composites. [90][91][92] Rubber with halogen atoms (through the substitution of H with Cl to a certain degree) exhibits significantly improved features. It is worth noting that gas permeation is high with partial substitution, which could be important in some applications.…”

“…Additional investigations have focused on volume modification of NBR, involving the addition of modifiers or fillers to the rubber matrix: (1) hydrogenation, 87,88 (2) ionic liquid catalysis for reactive compatibilization of NBR/EVASH/PP 89 . Furthermore, certain approaches are designed to modify filler surfaces for better compatibility with NBR in composites 90–92 …”