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)、電子顯微鏡(scanning electron microscopy, SEM)、小角度X光散射儀(microbeam small-angle X-ray scattering, SAXS)及廣角度X光繞射儀(microbeam wide-angle X-ray diffraction, WAXD)探討生物可分解高分子聚羥基丁酸酯共聚羥基戊酸酯(poly(3-hydroxybutyric acid-co-3-hydroxyvaleric acid), PHBV)和聚對二氧環己酮(poly(p-dioxanone), PPDO)兩成份摻合系統，以熔融結晶之方式製備樣品，觀察其結晶動力、球晶型態、上表面及內部晶板排列的構造。
首先改變組成比例以POM進行生長速率及球晶形貌的初步觀察，在球晶成長速率方面，相較於neat PHBV，加入PPDO後的混摻系統其球晶成長速率隨著PPDO含量增加而明顯下降，且產生最大球晶成長速率的溫度隨之往低溫移動。選擇75/25的組成比例做進一步的分析，發現隨著熔融溫度(Tmax)及結晶溫度(Tc)的上升，環帶寬度(band spacing)及整體環帶規則度(regularity)會有增加的趨勢，並嘗試從動力學的角度解釋為何在不同熱條件下，會造成其形貌規則度的變化，但結果顯示無特殊的對應關係，唯一的差別則是在於球核出現的時間點。以環帶最整齊且生長速率最快的Tc = 80 oC之樣品進行SEM分析，觀察球晶上表面與內部結構的晶板排列。表面觀察到晶板具有浮凸特徵以及與spiral方向一致的偏折行為，內部晶板同時存在與基材平行及垂直的兩種排列；此外也闡明了crack與domain，兩者不同的形成機制、起因及位置。接著利用microbeam SAXS及WAXD輔以證明在SEM觀察之晶板排列，推測出PHBV環帶狀球晶之ridge及valley分別對應內部垂直與水平的晶板。透過本研究的結果，可了解PHBV球晶是由兩種不同排列方向及不連續的晶板週期性重複而形成，而非傳統觀念的連續性晶板扭轉所組成，且此系統生成的相分離domain並不會對PHBV晶板排列造成影響。

A semi-crystalline polyester, poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), was crystallized in the presence of poly(p-dioxanone) (PPDO).
First of all, by comparison with the growth rate of neat PHBV at specific crystallization temperatures (Tc) from 60 oC to 90 oC, the growth rate of PHBV in blends significantly decrease with increasing PPDO contents. In addition, the growth rate of PHBV in blends of all compositions shows a maximum value with respect to Tc, while Tc at which the maximum growth rate occurs is dependent on blend composition. For PHBV/PPDO (75/25) blend system, ring-banded spherulites can be observed, and kinetic results indicate that the higher is Tmax, the longer is the initiation time for first appearance of nuclei. We also utilized scanning electron microscopy (SEM) to observe the top surface and the fractured surface in order to give complete images of the 3-D structures. On the other hand, the formation of crack and domain are two different mechanisms, reason, and location. The correlation between top surface and interior lamellar arrangement is that the lamellae are arranged perpendicularly to the substrate with cracks at ridge region but parallel to the substrate at valley region, showing counterclockwise bending on the top surface. Finally, synchrotron microbeam small-/wide-angle X-ray scattering (SAXS/WAXD) was used to further confirm growth mechanism observed by SEM.

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