以NH4HCO3碳酸氢氨为发泡剂,废纸浆纤维为增强体,玉米淀粉、PVA为基质,甘油和尿素作为复合增塑剂,辅以其它的各种助剂,利用挤出发泡法制备出一种可生物降解的复合发泡材料。并分别讨论该发泡材料的密度、发泡倍率、吸水性、回弹性以及泡孔形态。研究结果显示,材料的密度随着发泡剂含量的增加先减少后增加,当发泡剂含量为1.2%时,材料的密度最小为0.16g/cm3;发泡倍率、吸水率、线性尺寸变化量均随着发泡剂含量的增加先增加后减少,且在发泡剂含量为1.2%时,均达到最大值;随着发泡剂含量的增加,材料泡孔数量先增加后减少,孔径逐渐增大;当废纸浆含量为20%时,材料的泡孔数量多,孔径较小且分布比较均匀;当复合增塑剂含量为30%时,淀粉与废纸浆相容性较好,材料泡孔数量较多,且泡孔大小分布均匀。
The foamed composite could be completely biodegradable which was mainly prepared by corn starch and PVA, reinforced by waste pulp paper, foamed by NH4 HCO3 ,plasticized by the mixed plasticizer of glycerol/urea and other adjuvants by extrusion foaming method. Then, the foamed composites' density, foam expansion ratio, water absorbability, rebound rate, cell morphology and the effect of mixed plasticizer on the plastication of cornstarch were discussed. The results showed that the density decreased with increasing NH4 HCO3 content, then increasing. When the content of NH4 HC():~ was 1, 2~//oo, the composite had the lowest value which was 0.16 g/cma. The foam expansion ratio, water absorption rate and increase in length were all increasing with increasing NH4HC()a content, then decreasing. When the content of NH, HCO3 was 1.2~, they had the highest values. The number of cell firstly increased with increasing NH~ HCOa content, then decreasing. The side of cell became larger with increasing content of NH.~ HCO:~. When waste pulp paper content was 20~/oo, the number of cell was most and the side of cell was small and distributed well. When mixed plasticizer content was 30 %, starch and waste pulp paper had good compatibility, the number of cell was more and the side of cell distributed well.
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