Wheat straw/recycled polyethylene composites (WRPCs) were manufactured with wheat straw fibers (WS) and recycled polyethylene (rPE) using extrusion followed by hot pressing moulding. The chemical structure and the fiber morphology of WS were analyzed by FTIR and L&W fiber tester. The influence of WS size and content on the mechanical properties, thermal stability and moisture absorption of WRPCs were investigated. The results showed that the performance of rPE based composites was certainly enhanced with the addition of WS. The WRPCs filled with long particle size and high length-to-diameter (L/D) ratio WS could obtain the optimal tensile and flexural performances. With increasing WS contents, the tensile and flexural strength of composites exhibited an increasing trend and the elongation at break decreased gradually. The strength properties of WRPCs decreased when the fiber content was over 50%. The length and content of WS had a significant influence on the moisture absorption of WRPCs. Thermogravimetric (TG) analysis found that WS size had no remarkable impact on the thermal stability of WRPCs. The scanning electron microscopy (SEM) indicated the dispersity of WS in composites increased with the decreasing of WS size, while the interfacial adhesion of WRPCs decreased gradually with the increasing of WS content.

小麦秸秆/再生聚乙烯复合材料（WRPC）是用小麦秸秆纤维（WS）和再生聚乙烯（rPE）挤压成型，随后进行热压成型制造的。用FTIR和L＆W纤维测试仪分析了WS的化学结构和纤维形态。研究了WS的大小和含量对WRPC的力学性能，热稳定性和水分吸收的影响。结果表明，加入WS后，rPE基复合材料的性能肯定得到提高。填充了长粒径和高长径比（WS）的WRPC可以获得最佳的拉伸和弯曲性能。随着WS含量的增加，复合材料的拉伸强度和弯曲强度呈现增加趋势，而断裂伸长率逐渐降低。当纤维含量超过50％时，WRPC的强度特性降低。WS的长度和含量对WRPC的吸湿性有显着影响。热重分析（TG）分析发现WS尺寸对WRPC的热稳定性没有显着影响。扫描电镜（SEM）表明，随着WS尺寸的减小，WS在复合材料中的分散性增加；随着WS含量的增加，WRPC的界面附着力逐渐降低。