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结合聚合物异相成核的空穴模型,分析了含添加剂的聚合物异相成核理论。纳米级添加剂粒子比微米级添加剂粒子具有更小的尺寸和更大的表面积,与聚合物基体的接触更加紧密,因此其发泡制品具有更好的泡孔结构和性能。分析了聚合物/粘土纳米复合材料用超临界CO2发泡过程的影响因素。结果表明,剥离型纳米复合材料具有更小的泡孔尺寸和更大的泡孔密度。聚合物纳米复合材料与连续挤出发泡过程的结合为微孔发泡提供了一项新的技术。
Based on the hole model of heterogeneous nucleation of polymer, the heterogeneous nucleation theory of polymer containing additives was analyzed. Nanoscale additive particles have smaller size and larger surface area than the micron-sized additive particles, are more intimately contacted with the polymer matrix, and therefore have better cell structure and properties for their foamed articles. The influencing factors of foaming process of polymer / clay nanocomposites with supercritical CO2 were analyzed. The results show that the exfoliated nanocomposites have smaller cell size and larger cell density. The combination of polymer nanocomposites with continuous extrusion foaming provides a new technique for microporous foaming.