本研究使用結晶性高分子聚乙烯醇（PVA），利用電紡絲法製備聚乙烯醇纖維，探討在不同的變因下（濃度、電壓、工作距離），利用掃瞄式電子顯微鏡（SEM）來探討纖維直徑及形態上的變化，並透過此機制可以有效控制纖維尺寸及纖維尺寸分佈，並製備一系列不同直徑的PVA纖維，利用示差式掃瞄熱分析儀（DSC）來可以發現PVA纖維隨尺寸越小，玻璃轉移溫度（Tg）會往低溫偏移，熔融溫度（Tm）則會往高溫偏移的現象。透過廣角X光繞射（WAXD），來了解不同直徑下PVA纖維，其結晶度隨著尺寸變小而變小但其結晶尺寸則變大。透過小角度X光散射(SAXS)，可以發現不同直徑的PVA纖維其結晶形態為一維成長的結晶結構，並利用動態WAXD/SAXS/ DSC在升溫過程中，可以PVA纖維隨著溫度的提升會有再結晶的效應。因此，我們建議熔融峰的起始溫度作為PVA纖維的熔融溫度是比較恰當的。

We use electronspinning method to analysis crystalline polymer PVA nanofibers under different situation (concentration、voltage、work distance),and also use SEM to understand the variation of nanofibers diameter and morphology. So we can control the fiber diameter and size distribution of PVA nanofibers using by the electronspinning method. Then, we observe that the glass transition temperature and crystallinity shift to low temperature with decreasing the fiber diameter to be attributed increases of the CRR size and crystalline size. The structure of PVA nanofiber exhibits rod-like structure using by the Beacage approach. However, the melting peak independence on the fiber diameter is due to the formation of recrystallization during heating process revealed by simultaneous SAXS/WAXD/DSC measurement. Therefore, we propose that the onset temperature of melting peak can closely reflects the fiber diameter effect on the melting temperature.

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