中文摘要：

以低密度聚乙烯（LDPE）为基体树脂，木质素为填料，LDPE接枝甲基丙烯酸缩水甘油酯（LDPE—g-GMA）为增容剂，辅以发泡剂和交联剂，制备LDPE／木质素复合发泡材料，考察了LDPE—g—GMA及其用量对泡沫材料性能的影响．并分析了泡沫材料的微观形态。结果表明：LDPE—g—GMA可以有效降低LDPE／木质素复合泡沫材料的表观密度。使泡沫材料泡孔均匀细密；随着LDPE—g—GMA用量的增加，LDPE／偶联剂处理木质素（M-木质素）复合泡沫材料泡7L的平均直径先增大后减小，LDPE—g—GMA的用量存在最佳值，当用量为4份时，比强度达到10．96MPa／（g·cm^-3）．表观密度为0．533g／cm3。

英文摘要：

Low density polyethylene （LDPE）/lignin foam composites were prepared by using LDPE as basic materials, lignin as filler, LDPE-g-GMA as compatibilizer, and combining with foaming agent and cross-linker. The effects of LDPE-g-GMA and its amount on the properties of LDPE/lignin foam composites were investigated, and the morphology of foam material was analyzed. The results show that LDPE-g-GMA can effectively reduce the apparent density of LDPE/lignin foam composites and the foam cells are in uniform distribution; The cell average diameter of LDPE/M-lignin foam composites increases first and then decreases with the increasing of LDPE-g-GMA content. There exists the optimal amount of LDPE-g-GMA. When the amount is 4 phr, the specific strength of the foam composites is 10.96 MPa/（g·cm^-3）, the apparent density is 0. 533 g/cm^3.