Abstract：The paper exploits the use of the Xanthoceras sorbifolia husk as the filler of the composite materials, optimizes the process of the composite preparation, and explores the trend of the mechanical properties changing with the filler content. The surfaces of the Xanthoceras sorbifolia husk fibers are treated with alkali, silane coupling agent and the alkali treatment, followed by that of the silane coupling agent. The Xanthoceras Sorbifolia Husk Fibers/ High Density Polyethylene composites are prepared via the twin screw extrusion and the injection molding. The influence of processing methods and fiber contents on the mechanical properties, such as the tensile strength, the elongation at break, the elastic modulus and the impact strength, of the composites are investigated. The tensile strength and the elongation at break are found to increase for the composites extruded twice. The tensile strength and the elongation at break are decreased, the elastic modulus is increased, and the impact strength is changed in a wavy form with the increasing fiber contents. The fiber fracture mechanism and the spall- off mechanism are observed coexisting on the fracture surface of the composites.
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