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Fiber-reinforced polypropylene (PP) composites are widely used for structural bearing because of their excellent mechanical property. So, it is necessary to improve the mechanical property of fiber-reinforced PP composites. In this present, two-dimensional Ti 3 C 2 Mxene nanosheets were bound to short aramid fiber (SAF), forming Ti 3 C 2 nanosheets-modified SAF (Ti 3 C 2 /SAF), aiming to improve PP mechanical property. The Ti 3 C 2 nanosheets were obtained after hydrofluoric acid etching and ultrasonically delamination procedure, followed by chemically bound to the surface of H 3 PO 4 solution-treated SAF to form Ti 3 C 2 /SAF. The Ti 3 C 2 /SAF-reinforced PP (Ti 3 C 2 /SAF/PP) composites were prepared by a melt blending method. Scanning electron microscopy images showed that the Ti 3 C 2 /SAF modified with different concentration of Ti 3 C 2 nanosheets solution presented the distinct morphologies, with the 0.3 mg/ml Ti 3 C 2 /SAF formed a relatively uniform Ti 3 C 2 nanosheets coating on the SAF surface. Test results of mechanical performance indicated that the tensile and impact strength of Ti 3 C 2 /SAF/PP composites were significantly improved. Especially, the maximum tensile and impact strength of 0.3 Ti 3 C 2 /SAF/PP composite at 5 wt% reached to 37.8 MPa and 14.0 kJ/m 2 , which was increased by 11.5% (or 28.1%) in tensile strength and 12.9% (or 38.6%) in impact strength, compared with that of SAF/PP composite (or PP matrix). This can be attributed that Ti 3 C 2 nanosheets binding to SAF improved the interfacial bonding strength between SAF and PP. This work provides a promising strategy for improving the mechanical properties of fiber-reinforced PP composites.

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In this work, jute fiber and aluminum (Al) powder were used synergistically to improve the mechanical properties and color of polypropylene (PP) composites, which can be used as spray-free materials. The effect of jute fiber and Al powder on the mechanical properties of PP composites was systematically investigated. The results show that jute fiber and Al powder can significantly improve the tensile strength and impact strength of PP. Compared with pure PP, the tensile strength, impact strength, and elastic modulus of jute/Al/PP composites were increased by 55.1%, 78.9%, and 263%, respectively. Compared with Al/PP spray-free materials, they were increased by 11.2%, 9.07%, and 103%, respectively. Statistical analysis by one-way analysis of variance confirmed that Al powder and jute fiber have significant improvement on the mechanical properties of PP composites.