添加無機顆粒提高高分子泡孔密度是發泡加工中常見的方式，然而目前常見的礦物基天然成核劑因為粒徑尺寸分布不同，會造成發泡樣品品質差異，在本研究中，我們添加添加氣相合成的奈米矽顆粒(fumed silica)作為成核劑增加異質成核的效果，希望能有效降低泡孔尺寸並提高泡孔密度，並且能進一步提升產品的泡孔結構均勻性。
在本實驗中，我們將結果分為兩部分討論。首先，將硬度分別為85A和90A的兩種不同品牌TPU與是否經表面處理的奈米矽顆粒混合，以超臨界二氧化碳當作發泡劑發泡。我們觀察到添加矽顆粒後，泡孔結構有明顯的改變，泡孔密度明顯變高，但在某些情況下也觀察到大小泡孔結構。綜合所有實驗結果，顯示添加奈米矽顆粒明顯降低了泡孔尺寸並增加了泡孔密度。

Adding inorganic particles to increase the cell density of polymers is a common practice in foaming processing. However, due to the different particle size distribution of mineral based nucleating agents, the quality of foam could be different. In this study, we investigated effect of fumed silica as a nucleating agent to the cell size and cell density, and further improve the cell structure uniformity of the product.
This study contains two parts. First, two different brands TPUs with hardness of 85A and 90A were mixed with nanostructured silica particles with or without surface treatment, and foamed using supercritical carbon dioxide as a blowing agent. In the presence of nanosilica, the cell structure changed significantly, and the cell density was significantly increased. In some cases, bimodal structures were observed. Our results showed that nanosilica is an effect nucleating agent. The addition of nanosilica particles significantly reduces the cell size and increases the cell density of the TPU foam.

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