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>Influences of fiber fibrillation degree on mechanical and tribological performances of aramid fiber/nitrile rubber composites
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Influences of fiber fibrillation degree on mechanical and tribological performances of aramid fiber/nitrile rubber composites
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机译：Influences of fiber fibrillation degree on mechanical and tribological performances of aramid fiber/nitrile rubber composites
Three types of aramid fibers (AFs) with various surface fibrillation degrees were introduced into nitrile rubber (NBR) matrix to prepare the AF/NBR composites, respectively. Their impacts on the mechanical and tribological performances of the NBR composites were mainly studied. The results showed that, as the fiber content increased, the tensile strength of the AF/NBR composites increased after initially decreased, and the turning point moved toward the direction of lower AF content with the fiber fibrillation degree increase. In addition, when the AF content was low, the tensile strength decreased as the fibrillation degree increased, but the opposite trend was observed when the AF content became high. In addition, the tear strength increased with the increase of the fiber content and fibrillation degree. With the fiber fibrillation degree increase, the tan delta(max) of the composites decreased, indicating a stronger restriction on the NBR molecular chains. Furthermore, the surface fibrillation degree increase slightly decreased the friction coefficient (COF). The wear performance of the AF/NBR composites improved with the fiber content increase. The fibrillation degree increase further improved the wear resistance. It should be due to the tear strength increase and the enhanced interfacial interaction between the fiber and rubber matrix.
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