本研究使用聚醚-聚醯胺嵌段共聚物(polyether block amide, Pebax)以超臨界二氧化碳作為發泡劑探討 Pebax 發泡型態，由於熱塑性彈性體(TPE)之發泡材料會有發泡後收縮現象，會影響到成品性及型態，目前對於 Pebax 泡珠製備方面的文獻較少，同時也沒有文獻探討抗縮劑黏度對於彈性體泡珠製備方面的研究。
在過去本實驗室透過添加剛性高分子較低黏度聚醯胺 12 (PA-L)作為 Pebax 的抗縮劑改善 Pebax 發泡後收縮之情形，並觀察 Pebax 與 PA 12 相容情形，再額外添加高分子擴鏈劑(BASF Joncryl ADR-4368C, ADR)改善其泡孔破裂的情形。
在本實驗的第一部分將較高黏度的聚醯胺 12 (PA-H)共混作為 Pebax 的抗縮劑，在含浸壓力 2000 psi 的條件下，以不同含浸溫度(80°C-140°C)，通過一步法製備泡珠，成功分析 Pebax 添加高黏度的聚醯胺 12 (PA-H)的發泡行為，含浸溫度 130°C 時且PA-H 添加量達 20 wt%時，膨脹倍率最高的膨脹倍率可達到 7.02，同時樣品具有非常明顯的回澎現象。然而在不同的發泡溫度下，添加 20 wt%的 PA-H 高分子發泡後仍會觀察到破裂現象。添加擴鏈劑 ADR 後，泡體破裂現象得以改善，最高的膨脹倍率仍
可達到 6.50。本實驗研究結果與添加低黏度聚醯胺 12 (PA-L)實驗結果相互討論，對於不同黏度的抗縮劑，膨脹倍率的變化較不明顯，雖然較高黏度的抗縮劑使 Pebax 發泡材料具有非常明顯的回膨現象，但熔體強度過高同時也會限制泡孔的成長。
本研究第二部分將 Pebax 於 240°C 之下退火不同時間 10 min, 20 min, 30 min 改變 Pebax 材料的流變性質，增加其儲存模量，觀察其發泡行為的變化，在不添加抗縮劑的情況之下，退火 30 min 的 Pebax 樣品膨脹倍率可達到 7.49，並且有 20%的回澎現象，而退火樣品於發泡之後大部分中間皆會出現明顯的裂縫。

In this study, polyether block amide (Pebax) was foamed using supercritical carbon
dioxide as foaming agent. Since the thermoplastic elastomer (TPE) foam material shrink after foaming, the shrinkage affects the finished product and shape. At present, there are few literatures on the preparation of Pebax beads, and there is no literature discussing the preparation of elastomer beads with anti-shrinkage agents of different viscosities. In the past, rigid polymer with relatively low viscosity polyamide 12 (PA-L) was added as an antishrinkage agent for Pebax to reduce the Pebax foam shrinkage, and to observe the compatibility of Pebax with PA 12. At the same time, an additional polymer chain extender (BASF Joncryl ADR-4368C, ADR) was added to reduce the cell rupture.
In this study, the higher viscosity polyamide 12 (PA-H) was blended as an antishrinkage agent for Pebax. The Pebax bead foam was prepared by one-step foaming under the saturation pressure of 2000 psi with different saturation temperatures of 80°C-140°C. When the saturation temperature reached 130°C and the loading level of PA-H reached 20wt%, the highest expansion ratio could reach 7.02, and obvious foam re-expand phenomenon was observed. However, at different foaming temperatures, cracking was still observed after adding 20 wt% of PA-H polymer foaming. After adding the chain-enclosed agent ADR, the cell cracking phenomenon was improved, and the highest expansion ratio could still reach 6.50. The results of this experimental study are compared with the experimental results of adding PA-L. For anti-shrinkage agents with different viscosities, the change of expansion ratio is less obvious. Although the anti-shrinkage agent of higher viscosity makes the Pebax foam material have a very obvious rebound phenomenon, but the high melt strength will also
limit the growth of cells.

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