聚乙烯基木塑复合材料吸水率的研究

将配方中部分至全部的聚乙烯(PE)进行接枝改性，然后与木粉和少量润滑剂混合，用挤出成型法制备了木塑复合材料，研究了改性PE和木粉含量对木塑复合材料吸水率的影响。结果表明，配方中改性PE和未改性PE比例一定时，随着木粉含量降低，木塑复合材料的吸水率降低；在木粉含量较高时保持改性PE和未改性PE总含量不变，则随着改性PE替代未改性PE的量增加，木塑复合材料的吸水率降低，当改性PE完全替代未改性PE时，木塑复合材料的吸水率降至5.5 %；木塑复合材料的吸水率越低，其吸水后强度的变化越小。

Studies on Water Absorption of Wood Flour-Filled Polyethylene composites

MAH-g-polyethylene (PE)/neat PE/ wood-flour composites were prepared by extrusion. The influence of the content of MAH-g-PE and wood-flour on the water absorption of the composite was studied. Kept the weight ratio of MAH-g- PE/neat PE constant, the water absorption decreased with decreasing wood-flour content. At high wood-flour loading, the higher the content of MAH-g-PE, the lower the water absorption. The lower the water absorption, the higher the wet mechanical properties.