遇水崩解型聚苯乙烯发泡性能的研究

Study on Foaming Performance of Water-Disintegrable Polystyrene

在聚丙烯酸钠粉末与聚苯乙烯原位共混的过程中加入不同第二成核剂聚乙烯蜡或纳米碳酸钙.然后将共混物进行发泡,用扫描电镜和偏光显微镜考察了聚丙烯酸钠粉末在发泡样品中的分布及聚丙烯酸钠粉末添加量对泡孔结构的影响。结果表明.聚丙烯酸钠12份(相对苯乙烯为100份)时,粉末在发泡样品中分散均匀,泡孔密度较大,泡孔分布均匀。泡孔壁较薄,开孔率低,发泡样品具有遇水崩解性。试验还发现。聚乙烯蜡添加量为0.5份或者纳米碳酸钙添加量为1.0份时.能够明显改善泡孔均匀性,降低开孔率。

Different kinds of the second nucleating agents polyethylene wax or nanocalcium carbonate were added when the PAANa powder and PS were in-situ blended. Then the blends were foamed. The distribution of PAANa powder in foaming samples and the effects of the content of PAANa powder on cell structure were investigated by SEM and polarized microscope. The results show that PAANa powder disperses homogeneously in foaming samples, cell density is large, cell distribution is homogenous, cell wall is thin, and opening rate is low when PAANa powder is 12 parts based on per hundred monomer styrene. Simultaneously, the foaming samples have water-disintegrable ability. It is also found that the cell homogeneity is improved obviously and opening rate is reduced when the addition quantity of nucleating agent polyethylene wax is 0.5 parts based on per hundred nonormer styene or nano-calcium carbonate is 1.0 parts based on per hundred nonormer styrene.