研究中利用偏光顯微鏡(polarized optical microscope, POM) 及原子力顯微鏡 (atomic force microscope, AFM) 對左式聚乳酸[poly(L-lactic acid), PLLA]/聚己內酯[poly(ε-caprolactone), PCL]摻合體進行球晶形貌觀察。PLLA/PCL 20/80 摻合體以兩階段的恆溫程序進行製備。若使用不同的第一階段持溫溫度，而固定第二階段的持溫溫度在30 oC，可在第一個持溫階段發現，PLLA晶體以同心環帶狀的形貌沿著扭曲狀的環帶成長，而在第二個持溫階段時，PCL的晶體形成非環帶的負型球晶 (其球晶的第一、三象限呈現橘色)。若固定第一階段的結晶溫度在117 oC，而使用不同的第二階段持溫溫度，將可觀察到扭曲狀的環帶不具有任何固定的圖案，扭曲狀環帶的出現來自不同的 PCL含量因相分離而擴散進入 PLLA 的晶體下方。在較低的第二階段結晶溫度條件下，PCL所生成的非環帶狀負型球晶不會改變扭曲狀環帶的樣貌；若第二階段的結晶溫度較高時，PCL則生成非環帶狀的正型球晶 (其球晶的第一、三象限呈現藍色) 且扭曲狀環帶的形貌將受到影響而轉變為分枝狀的表面形貌，其形成原因認為是來自PLLA晶體下的PCL在此階段進行球晶成長，其晶體排列伴隨著高的鏈移動及牽引作用所造成。利用AFM可清楚的觀察到小的同心環帶狀的晶體排列，推論是因為具有韻律性的成長所致。

Blend of poly(L-lactic acid) (PLLA)/poly(ε-caprolactone) (PCL) has been investigated by using polarized optical microscope (POM) and atomic force microscope (AFM). The two-step isothermal crystallization of PLLA/PCL=20/80 with various first crystallization temperatures and a fixed second crystallization temperature of 30 °C was investigated. Wrinkle band encountered along with small concentric ring-banded were found in PLLAPCL=20/80. Wrinkle band and small concentric ring-banded spherulites formed at first crystallization temperature, meanwhile at the second crystallization temperature, the crystal PCL formed a ringless negative-sign where orange color filled for first and third quadrants. Furthermore, the two-step isothermal crystallization of PLLA/PCL=20/80 with a fixed first crystallization temperature of 117 °C and various second crystallization temperatures was also investigated. In this term, we can observe that the morphology of wrinkle band does not have any fixed pattern based on the morphology is similar for different samples treated by the same condition. It happened due to the different diffused and inserted proportion of PCL below PLLA crystal which is attributed by phase separation. Meanwhile, ringless negative-sign spherulites lastly formed after suddenly cooled down or quenched to lower second crystallization temperatures without changing of wrinkle band morphology. On the other hand, at the higher second crystallization temperature, the PCL crystal formed a ringless positive-sign, as indicated with blue color filled for first and third quadrants, and also the wrinkle band changed to branch-like band. The branch-like band is attributed to the high chain mobility when reorganized crystal of PCL to pack at higher second crystallization temperature 47 °C. Small concentric ring-banded spherulites which can be clearly observed in atomic force microscope were induced by rhythmic growth.

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