玉米秸秆粉体/聚乙烯复合材料的制备及性能

研究利用玉米秸秆粉体作为增强材料与聚乙烯(PE)通过挤出成型制备玉米秸秆粉体/PE复合材料的可行性,并考查了玉米秸秆粉体添加量及其尺寸对复合材料力学性能的影响。结果表明:随玉米秸秆粉体添加量的增加,玉米秸秆粉体/PE复合材料的拉伸强度、拉伸模量呈先升后降趋势,弯曲模量逐渐增大,冲击强度则逐渐减小;当玉米秸秆粉体添加量为50%时,复合材料的综合力学性能最佳。此外,玉米秸秆粉体/PE复合材料的力学性能随玉米秸秆粉体长径比的增大而增强;在考查范围内,添加40目h(粒径)≤60目玉米秸秆粉体复合材料的力学性能最好。电镜结果显示添加20目h≤40目玉米秸秆粉体/PE复合材料粉体在基体中分布不均,断面形貌最差,而添加40目h≤60目玉米秸秆粉体复合材料的断面形貌最佳。

Preparation and Properties of Corn Stalk Fiber-High Density Polyethylene Composites

We studied the feasibility of corn stalk fibers as the reinforcement of corn stalk fiber ( CSF)-polyethylene ( PE) com-posites, and investigated the effects of fiber addition and fiber size on mechanical properties of resultant composites.The tensile strength and tensile modulus presented a trend of first increase and then decrease.The flexural modulus increased slightly with the increasing of CSF application content, while the impact strength decreased obviously.The comprehensive mechanical property of CSF-PE composites reached the best level at CSF content of 50%.With the increasing of aspect ra-tio of CSF, the mechanical performance of resultant composites was enhanced.The composites had the best mechanical strength when the aspect ratio of corn stalk fiber was 40-60 mesh.By the scanning electron microscopy, the composites containing 20-40 mesh corn stalk fiber had the worst fracture morphology due to non-uniform fiber distribution, while the fracture surface of composites made of 40-60 mesh corn stalk fiber was the best.