Evolution of Filler Network Structure and Performance Evolution of Composite Materials in Carbon Nanotubes in Nitrile Rubber With Different Polarities

ABSTRACT This study investigated the effects of rubber polarity on carbon nanotubes (CNTs) dispersion, the evolution of the filler network structure in composite materials, and mechanical properties by using nitrile rubber (NBR) with varying acrylonitrile (ACN) content as the matrix and incorporating CNTs. As the ACN content increased (the mass percentages of acrylonitrile are 18%, 28%, and 34%, respectively), the polarity of NBR enhanced, improving the interfacial interaction with polar CNTs, and significantly enhancing the uniform dispersion of CNTs in the rubber matrix. The results indicate that as ACN increases, CNTs influence the filler network structure of NBR/SiO 2 composites. In a rubber matrix with 34% acrylonitrile content, CNTs agglomerate, impairing the interaction between nitrile rubber and SiO 2 . Conversely, in a rubber matrix with 18% acrylonitrile content, CNTs hinder the formation of an optimal filler structure with SiO 2 . Dynamic mechanical properties were tested using dynamic mechanical analysis (DMA), and Mooney‐Rivlin curves were analyzed to investigate the interactions between fillers, between fillers and rubber, and between rubber and rubber. This study revealed the regulatory mechanism of CNTs on the performance of NBR/SiO 2 composites, providing a theoretical basis for the design and modification of high‐performance polar rubber/nanocomposites in subsequent research.