Preparation and mechanical properties of natural rubber composites reinforced by modified molybdenum disulfide

The filler-rubber interaction and filler dispersion in natural rubber (NR) composites are important factors in determining mechanical properties. Herein, Molybdenum disulfide (MoS2) and Al2O3-coated MoS2 nanospheres are incorporated in NR/carbon black composites. The effects of MoS2 and Al2O3-coated MoS2 on the morphology, thermal and mechanical properties of the NR composites are investigated. The morphology analysis indicates that Al2O3-coated MoS2 could greatly improve the dispersion of carbon black in NR composites. MoS2 filler and carbon black show a synergetic effect on improving the properties of NR composites, leading to high abrasion resistance, tensile strength, elongation at break and expected dynamic mechanical properties. The thermal conductivity of NR composites increases with increasing the content of MoS2 and Al2O3-coated MoS2. The thermal stability of the NR composites is also effectively improved by filling MoS2 and Al2O3-coated MoS2. Furthermore, a small amount of Al2O3-coated MoS2 significantly improves the abrasion resistance, wet grip and decreases rolling resistance of the composites. Al2O3-coated MoS2 exhibits its potential application in green tires with good performance.