聚醚-聚醯胺嵌段共聚物(polyether block amide, PEBAX)，是一種相對較新型且昂貴的熱塑性彈性體(TPE)，具備優異的抗衝擊性與柔韌性，本研究以二氧化碳作為發泡技術探討聚醚-聚醯胺嵌段共聚物(PEBAX)的發泡過程，由於TPE發泡材料會有發泡後收縮的問題，影響到產品的外觀及成型性。一般而言可加入剛性較高的高分子改善收縮，本研究加入聚醯胺6 (PA 6)當作抗縮劑，試圖抵抗收縮效應，另一方面PA 6的成本遠較PEBAX低，也有降低成本的效果。並也添加擴鏈劑如stryrene maleic anhydride (SMA)或高分子擴鏈劑(BASF Joncryl ADR-4368C, ADR)改善泡孔型態。
本實驗首先在PEBAX中加入10至 20 wt%的PA 6抗縮，實驗結果發現雖然PEBAX與PA 6不相容，但完全不影響發泡結果，對於抗縮也有改善。但PA 6達到20 wt%時，發泡後樣品中心開始發生裂縫。另一方面，單獨添加SMA或 ADR會使PEBAX的結晶度明顯下降、黏度上升並增強機械性質，同時，單獨添加SMA或ADR對於PEBAX發泡後的抗縮也有明顯改善，而且添加ADR還能進一步提升材料熱穩定性與發泡溫度。
在最後我們探討同時加入PA 6與ADR於PEBAX中的發泡情形，發現添加ADR會主導發泡時的結構變化，同時添加ADR與20 wt% PA 6時，發泡後不僅材料中的裂縫消失，而且材料收縮的情形相較於純PEBAX，也有改善，本研究在發泡壓力13.8 MPa與發泡溫度140°C的情況下，成功製備出膨脹倍率約5.2倍，孔徑為10 μm的微發泡材料，本研究也同時證明了，添加PA 6對PEBAX發泡性能並沒有顯著的影響。

Polyether block amide (PEBAX) is one of relatively advanced and expensive of thermoplastic elastomers (TPE), known for possessing high impact resistance and great flexibility. However, shrinkage could occur when TPE is foamed, this may affect the appearance of the product and subsequent formability. In general, rigid polymers can be added to improve shrinkage. In this study, polyamide 6 (PA 6) was added as an anti-shrinkage agent to resist the foam shrinkage. Moreover, the cost of PA 6 is much lower than that of PEBAX, and the cost can also be reduced. A chain extender such as styrene maleic anhydride (SMA) or a polymer chain extender (BASF Joncryl ADR-4368C, ADR) was also added to improve the cell morphology.
In the first part of study, 10 to 20 wt% of PA 6 was added to PEBAX. The results showed that although PEBAX was incompatible with PA 6, it did not affect the foaming result, and the shrinkage ratio decreased. However, when PA 6 reached 20 wt%, the sample began to crack. On the other hand, the addition of SMA or ADR could significantly reduce the crystallinity, increase the viscosity and enhance the mechanical properties of PEBAX. The addition of SMA or ADR alone could also improve the shrinkage resistance of PEBAX after foaming and the addition of ADR could further enhance thermal stability and foaming temperature of PEBAX.
Finally, both PA 6 and ADR were added to PEBAX simultaneously. It was found that the addition of ADR dominated the structural change during foaming. When ADR and 20 wt% PA 6 were added, not only the cracks in the blends disappeared after foaming, the shrinkage ratio decreased as well in comparison with the pure PEBAX. In this study, a microcellular foam with an expansion ratio of about 5.2 times and a cell diameter of 10 μm was successfully prepared. The results of this study also proved that the addition of PA 6 has no significant effect on the PEBAX foam.

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