摻雜聚右旋乳酸之聚左旋乳酸靜電紡絲其型態與結晶行為

Abstract

在本研究中，我們探討靜電紡絲纖維的型態與結晶行為。利用摻雜聚右旋乳酸改變聚左旋乳酸的結晶行為，我們發現它們的纖維直徑有些變化。我們也嘗試讓材料形成stereocomplex (SC)晶體，觀察其在靜電紡絲過程中如何影響相分離行為。 我們相信一旦相分離發生且皮層形成後，纖維的尺寸便不再變化。因此，越大的直徑代表著此種材料越早產生相分離。我們發現纖維直徑大的材料，在我們的DSC測試中也具有比較高的結晶度，表示在靜電紡絲過程中，結晶及固-液相分離扮演者重要的角色。 在我們的實驗中，我們發現一種新的晶體，我們稱之為SC΄晶體，其熔點比SC晶體稍微低一些。我們之後做了一些薄膜實驗，推測SC΄晶體的形成，可能與靜電紡絲過程中凝結下來的水氣有關。

In this study, we investigate the morphology and crystallization behavior of electrospun fibers. By blending PDLA with PLLA to alter its crystallization behavior, we observed a change in their fiber diameter. We also tried to form stereocomplex (SC) crystal in our materials, to see how it affects the phase separation process during electrospinning. We believe that once the phase separation occurs and the skin forms, the dimension of the fibers will not change. Thus, larger diameter indicates that the material undergo phase separation earlier. We found that materials with larger diameter also yield higher crystallinity in our DSC test, meaning that crystallization might play a role in solid-liquid phase separation during electrospinning. In our experiment, we also found a new crystal structure, we called it SC΄ crystal, whose melting point is just below that of SC crystal. We then conducted some experiment with membranes and concluded that the forming of SC΄ crystal might be related to water condensed during electrospinning process.