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以滑石粉为成核剂,超临界CO_2为发泡剂,采用间歇釜式方法制备微孔发泡木粉/聚丙烯复合材料。采用DSC、XRD和SEM对微孔发泡木粉/聚丙烯复合材料的结晶行为与泡孔结构进行了测定与分析。结果表明:滑石粉的添加能够提高微孔发泡木粉/聚丙烯复合材料的结晶温度,诱导产生不完善的α晶型;能够提高聚合物基体的熔体黏度,减小泡孔尺寸,增加泡孔密度,促使泡孔尺寸分布更均匀,最终能够形成泡孔密度为1.0×10~9个/cm~3、平均泡孔半径为16.4μm、发泡倍率为18倍、表观密度约为0.055g/cm~3的微孔发泡木粉/聚丙烯复合材料。
Using talc as nucleating agent and supercritical CO_2 as foaming agent, the microcellular foaming wood flour / polypropylene composite was prepared by the batch method. The crystallization behavior and cell structure of microporous foaming wood flour / polypropylene composites were measured and analyzed by DSC, XRD and SEM. The results show that the addition of talc can increase the crystallization temperature of the microporous expanded wood flour / polypropylene composites and lead to the formation of the imperfect α crystal. The melt viscosity of the polymer matrix can be increased, the cell size can be decreased, Cell density to promote cell size distribution more uniform, and finally to form a cell density of 1.0 × 10 ~ 9 / cm ~ 3, the average cell radius of 16.4μm, the expansion ratio of 18 times the apparent density of about 0.055g / cm ~ 3 microporous foam wood / polypropylene composite material.