Effect of Fiber Preload on Mechanical Properties of Polyurethane Homogeneous Reinforced Composites
Aiming at the difficulty of recycling traditional fiber-reinforced composites and the low strength of homogeneous fiber-reinforced composites,thermoplastic polyurethane homogeneous reinforced composites were prepared by in-mold reaction molding method in this paper.The influence of fiber preload on the properties of the prepared composites was investigated by mechanical property tests and micro-morphology.The results showed that the elongation at break of the composites gradually decreased and the tensile strength and modulus gradually increased with the increase of fiber preload in the range of 0～1.1 N.The tensile strength reaches a maximum of 20.99 MPa and strength enhancement efficiency of 84.6%at a preload of 0.9 N.The modulus enhancement efficiency reaches a maximum of 85.3%at a preload of 1.1 N.The mechanical properties of polyurethane homogeneous reinforced composites can be effectively enhanced by appropriate fiber preload.
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