本實驗中利用偏光顯微鏡 (polarized optical microscopy，POM)、環境式掃瞄電子顯微鏡 (environmental scanning electron microscopy，E-SEM) 及原子力電子顯微鏡 (atomic force microscopy，AFM)，對聚氧化乙烯 [poly(ethylene oxide)，PEO]/左式聚乳酸 [poly(L-lactic acid)，PLLA] 此相容摻合系統進行 crack 型態及 PLLA 之球晶形貌探討，並對聚乙烯基甲醚 [poly(vinyl methyl ether)，PVME]/聚己二酸二己酯 [poly(1,6-hexamethylene adipate)，PHA] 此相容摻合系統，進行晶板堆疊方式之觀察。
PEO/PLLA 摻合系統部份，透過組成比例改變及兩階段的結晶程序(試樣先於 110 oC 使 PLLA 高分子先長晶，再降至室溫使 PEO 高分子長晶)，可觀察到 radial 及 irregular 兩種 crack 型態，在組成70/30 時為 crack 型態隨 PEO 含量增加，由 radial crack 轉變為 irregular crack 之過渡階段，當 PEO 含量為 50-60 wt% 具 radial crack，含量 80-90 wt% 為 irregular crack。透過 OM、SEM 及 AFM 觀察水洗蝕刻後之樣品，認為PEO 長晶過程中隨 PEO/PLLA 組成比例改變所出現的 crack 型態，與該組成下 PLLA 受融熔態 PEO 影響所呈現的 PLLA 晶板排列結構有關，而此種 PEO 長晶過程中所引發的 crack，認為是由於 PEO 結晶過程，因高分子鏈段摺疊造成體積變小所形成的空缺。
PVME/PHA 摻合系統部份，在低膜厚 PHA 純樣品形成正型球晶之結晶溫度 (Tc=38-46 oC) 下，透過加入 20 wt% 的不定形 PVME，使 PVME/PHA 20/80 摻合物之結晶型態，在結晶溫度 Tc=38-45 oC 時呈現負型球晶，而於 Tc=46 oC 時回到正型球晶，且在 Tc=42-44 oC 之間，形成環帶規則度較低的環帶狀球晶。透過 OM 及 AFM 觀察水洗蝕刻樣品，發現PVME/PHA 20/80 分別於 Tc=38、43、46 oC 結晶之試樣，其 PVME 存在於 PHA 球晶中的位置有所不同。而球晶型態 (正型、負型) 的差異來自於 edge-on 晶板的有無。透過 20 wt% PVME 的加入，有助於低結晶溫度 (Tc<46 oC) 下之 PHA 晶板以 edge-on 方式存在，若其 edge-on 晶板週期性的出現，將可得到環帶狀球晶。若對此系統進行交替溫度長晶，可得到類似環帶狀球晶之球晶形貌，且具有週期性的高度變化。

In this study, the crack behavior and the PLLA crystal morphology of poly(ethylene oxide)/poly(L-lactic acid) (PEO/PLLA) blends and lamellae arrangement of poly(vinyl methyl ether)/poly(1,6-hexamethylene adipate) (PVME/PHA) blend system were studied by using polarized optical microscopy (POM), environmental scanning electron microscopy (E-SEM) and atomic force microscopy (AFM).
In PEO/PLLA blend system, two types of cracks (radial and irregular cracks) were observed upon changing of the composition and the two-stage crystallization procedure (sample prior cooled to 110 oC for PLLA crystallization and then cooled to ambient temperature for PEO crystallization). For the composition of 70/30, both radial and irregular cracks occur in the sample. However, when the PEO content is 80-90 wt% or 50-60 wt% only irregular crack or radial crack can be observed, respectively. The subsequent observation of etched-sample by using OM, SEM and AFM indicates these two types of cracks have correlation with PLLA lamellae structure under different PEO/PLLA composition. The crack occurs due to the impingement of the later-grown PEO spherulites and which are overlapped with the earlier-grown PLLA spherulites. Such PEO-induced crack was caused by the volume reduction due to the PEO crystallization process.
In PVME/PHA (20/80) blend, negative spherulites were observed at crystallization temperature (Tc) at 38-45 oC then turn to positive spherulite at Tc=46 oC and above. However, neat PHA forms positive spherulite in the Tc ranging from 38-46 oC. Apparently, amorphous PVME has contribution to the alternating sign of spherulite in PVME/PHA (20/80) blend. By adding 20 wt% PVME, irregularity ring-band spherulite can be observed at Tc=42-44 oC. The observation of etched-sample by using OM and AFM indicates that PVME/PHA 20/80 blend have different kinds of PVME washed-out position under different Tcs (Tc=38, 43, 46 oC). The type of spherulite (negative or positive) is due to the edge-on lamellae exist or not. By adding 20 wt% PVME, PHA can form edge-on lamellae in the lower crystallization temperature (Tc<46 oC). The ring-banded spherulite can be occurred if the edge-on lamellae appear periodically. If the PVME/PHA 20/80 blend with alternating crystallization temperature process, it can form the crystal morphology similar with ring-banded spherulite and has periodic height variation.

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