Poplar fiber was treated with phosphate solution as a modifier and then wood fiber/high-density polyethylene (HDPE) degradable composite was prepared by melt blending with HDPE. The effects of phosphate solution concentration on tensile strength and flexural strength of composites were investigated. The surface morphology of phosphate-treated poplar fibers was observed by scanning electron microscopy. The results show that the phosphate treatment increases the surface roughness of the poplar fiber, increases the strength of the single fiber, and effectively improves the mechanical adhesion to the HDPE matrix. However, when the phosphate concentration is too large, the density of the cellulose molecular chains is lowered, and the mechanical properties of the whole fiber are lowered. When the concentration of phosphate solution is 3%, the treatment time is 4 h, and the treatment temperature is 60°C, the tensile properties, bending properties, and water resistance of poplar fiber/HDPE composites are the best.

磷用磷酸盐溶液作为改性剂处理oplar纤维，然后与HDPE熔融共混制备木纤维/高密度聚乙烯（HDPE）可降解复合材料。研究了磷酸盐溶液浓度对复合材料拉伸强度和弯曲强度的影响。通过扫描电子显微镜观察磷酸盐处理过的杨树纤维的表面形貌。结果表明，磷酸盐处理增加了杨树纤维的表面粗糙度，增加了单纤维的强度，有效提高了对HDPE基体的机械附着力。但磷酸盐浓度过大时，会降低纤维素分子链的密度，降低整个纤维的力学性能。当磷酸盐溶液浓度为 3% 时，