本研究利用偏光顯微鏡(polarized optical microscopy, POM)、微分掃描熱卡計(differential scanning calorimeter, DSC)、廣角X光繞射儀(wide-angle X-ray diffraction, WAXD)、原子力顯微鏡(atomic force microscopy, AFM)、環境式掃描式電子顯微鏡(environment scanning electron microscopy, E-SEM)分別探討：聚芳香羧酸酯類聚對苯二甲酸癸二酯[Poly(decamethylene terephthalate), PDT]及PDT/聚對苯二甲酸十二二酯[Poly(dodecamethylene terephthalate), PDoT]混摻系統之結晶型態、晶態分析、表面及截面晶板型貌；小分子鄰苯二甲酸(phthalic acid, PA)與其他相似結構小分子之結晶型態、表面及截面晶板型貌。
在PDT系統中，利用POM觀察結晶形貌，在低溫的溫度區間 (RT~110 oC) 形成雙層環帶球晶 (double ring-banded)，在高溫的區間 (120~125 oC) 則形成非傳統型的同心環帶狀球晶 (concentric ring-banded)。同時藉由加上上蓋觀察加蓋後double ring-banded及concentric ring-banded兩種球晶結晶形貌的改變，並探討其形成機制，針對非傳統型的同心環帶狀球晶，沒有加蓋的情況下，生成此種球晶的樣品厚度在一定範圍內 (300nm~12um)，利用原子力顯微鏡分析，球晶沿著軸方向呈現規律的高低起伏並形成crystal-rich及crystal-poor bands的交替，為rhythmic growth之成長模式；針對一般的雙層環帶球晶，將樣品製備為塊材狀態並將之斷裂，再利用環境式掃描式電子顯微鏡觀察球晶在三維尺度下球晶晶板的排列情形，在斷截面ridge和valley分別是由tangential及radial方向的晶板組成，由於PDoT具有與PDT相似的結晶行為，因此將此兩材料混摻並作分析，混摻過後原本各自會形成的concentric ring-banded球晶消失，形成ringless的球晶。
在小分子系統中，phthalic acid溶於ethanol/water (20/80) 的溶劑，並利用溶劑揮發的方式在不同的溫度下 (RT~110 oC) 結晶皆會形成環帶狀球晶，藉由環境式掃描式電子顯微鏡觀察球晶在平面以及斷截面的晶板型貌以及排列情形，發現ridge及valley分別是由vertical以及horizontal型貌的晶板所組成。

In this study, we compare the banded spherulite forming by long-chain polymer and small-molecule, and discuss the mechanism of forming banded spherulite for those two. Polymer and small-molecule crystal samples were prepared by melt-crystallization and solvent evaporation-induced crystallization methods, respectively. The reason for forming banded spherulite for both small-molecule and polymer systems were caused by different lamellar orientation at ridge and valley that were different from traditional lamellar twisting.

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