本實驗將經表面處理與未經表面處理的兩種奈米矽顆粒，與AL和AU這兩種不同公司製造的醚類TPU以雙螺桿押出機摻混，比較奈米矽顆粒是否有表面處理對發泡結果差異。因為奈米矽顆粒的密度較低，而將樣品混入0.5 wt%礦油讓奈米矽顆粒沾附於TPU顆粒上，並以桶式攪拌機預先攪拌以促進分散。為了瞭解礦油對TPU發泡的影響，因此也製備了僅添加礦油的TPU混煉並進行發泡，以作為對照組。
　　根據實驗結果顯示，添加奈米矽顆粒於AL的TPU中，在泡孔結構改善上並沒有幫助；對於AU的TPU，奈米矽顆粒則能起到作用，能降低泡孔尺寸並提高泡孔密度，而進行表面處理的奈米矽顆粒的泡材能比未進行表面處理的奈米矽顆粒的泡材有更高的膨脹倍率。原本我們認為添加礦油應該不會影響TPU的性質，然而就實驗結果顯示，添加0.5 wt%礦油對於AL的TPU最大膨脹倍率有明顯的影響。

In this study, two types of ether TPUs made by two different companies, AL and AU, were compounded by a twin-screw extruder with two types of nanosilica particles, surface-treated and without surface-treated,and compared the difference in foaming results between the surface-treated and without surface-treated nanosilica particles. Because the density of the nanosilica particles is extremely low, the samples were mixed with 0.5 wt% mineral oil to allow the nanosilica particles to adhere to the TPU particles, and then pre-blended with a barrel mixer to promote dispersion. In order to understand the effect of mineral oil on the foaming of TPU, TPU with only mineral oil added was also prepared for compounding and foaming, which was used as a control group.
According to the experimental results, the addition of nanosilica particles to the AL TPU did not help to improve the cell structure, while the nanosilica particles of the AU TPU could decrease the cell size and increase the cell density, and the foams with surface-treated nanosilica particles could have a higher expansion ratio than the foams with without surface-treated nanosilica particles. Originally, we thought that the addition of mineral oil should not affect the properties of TPU, however, the experimental results showed that the addition of 0.5 wt% mineral oil has a significant effect on the maximum expansion ratio of AL TPU.

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