中文摘要：

采用偶氮二甲酰胺作为发泡剂、木粉和聚苯乙烯树脂为主要原料,通过自由发泡挤出成型法制备聚苯乙烯基发泡木塑复合材料,研究木粉粒径、偶联剂以及成核剂对复合材料的泡孔形态、泡孔分布、力学性能和表观密度的影响。结果表明：较小粒径（80目〈d≤120目）的木粉能够赋予复合材料更好的泡孔形态、更大的泡孔密度、更均匀的泡孔分布和更高的力学强度,与采用40目〈d≤80目木粉的复合材料相比,弯曲强度和拉伸强度分别提高了21.9%和47%。1200目滑石粉是适宜的成核剂,能有效地提高泡孔的密度,降低复合材料的表观密度。偶联剂马来酸酐接枝聚苯乙烯的添加,不仅改善了发泡复合材料的力学性能,而且使泡孔的平均直径更小;而加入硅烷偶联剂的发泡复合材料的泡孔平均直径较大,力学性能表现较差,但具有较低的表观密度。

英文摘要：

The foamed polystyrene（PS）based wood plastic composites,using azodicarbonamide（AC）as blowing agent and wood flour and PS as main materials,were prepared by free foaming method.The effects of wood flour particle size,coupling agent,and nucleating agent on cell morphology,cell distribution and mechanical properties of the composites were studied.Results showed that when the wood flour particle size was 80-120 mesh,the composites had better cell morphology,higher cell density,smaller cell size and much more uniform cell distribution,and the flexural strength and tensile strength increased by 21.9 percent and 47.0 percent compared with the composites containing 40-80 mesh wood flour.The 1200 mesh talc was a promising nucleating agent,which could effectively increase the cell density and decrease the apparent density of the composites.For the foamed composites with maleic anhydride graft copolymer（PS-g-MAH）,the mechanical properties were improved,and the average diameter of the cell became much smaller,and for that with the silane coupling agent,the average diameter of the cell was bigger,and the mechanical properties behaved poorly,but the apparent density was lower.