本研究利用偏光顯微鏡(Polarized optical microscopy, POM)、電子顯微鏡(Scanning electron microscopy, SEM)、微光束廣角度X光散射儀(Synchrotron microbeam wide-angle X-ray diffraction, WAXD)和微光束小角度X光散射儀(Synchrotron microbeam small-angle X-ray scattering, SAXS)探討生物可分解高分子聚己二酸二丁酯〔poly(1,4-butylene adipate), PBA〕與混摻加入聚氯乙烯〔poly(vinyl chloride), PVC〕後，球晶上表面、內部結構、形成機制與其應用。
第一部分為純PBA，在熔融溫度150 ℃下，觀察到PBA在結晶溫度(crystallization temperature, Tc) 29 ℃至33 ℃時表現出環帶狀球晶形貌，且在Tc = 32 ℃時擁有最規則的環帶，當結晶溫度低於29 ℃和高於33 ℃時，球晶型貌為樹枝狀球晶(ringless)。本研究將具有最規則環帶狀球晶形貌的Tc = 32 ℃和具有樹枝狀球晶形貌的Tc = 40 ℃交錯結晶，使球晶形成人造環形貌，以POM觀察，並針對球晶中不同形貌的規律排列情形，進行虹彩現象的觀察，並分析虹彩現象出現的條件。接著以SEM觀察變溫球晶的上表面和內部晶板排列情形，可以觀察到上表面由不規則形狀的凸起顆粒排列成弧狀形成環帶的ridge，平坦部分則為valley，而在平坦的樹枝狀形貌部分則觀察到了不規律出現的放射狀片狀凸起，推測為環帶ridge的延續，為了建立合理的生長機制，以synchrotron microbeam WAXD和SAXS輔助結果，構築出完整的球晶立體模型。
第二部分為PBA/PVC系統，同樣以150 ℃作為熔融溫度，將PBA/PVC (80/20)的薄膜樣品在不同的結晶溫度下結晶後，以POM和SEM進行觀察。PBA在結晶溫度29 ℃至33 ℃時為環帶狀球晶形貌，然而，當PBA混摻加入PVC後，在不同的結晶溫度下，皆無觀察到環帶狀球晶形貌，反而是在結晶溫度38 ℃至42 ℃時，觀察到球晶的核心處出現了凸起的羽毛狀球晶，並且隨著結晶溫度的上升，球核處的羽毛狀球晶趨於小型，最後以synchrotron microbeam WAXD和SAXS輔助結果，建構出合理的生長機制。

This study employed polarized optical microscopy (POM), photonic iridescence property experiments, scanning electron microscopy (SEM), synchrotron microbeam wide-angle X-ray diffraction (WAXD), and synchrotron microbeam small-angle X-ray scattering (SAXS) to investigate the top surface, internal structure, formation mechanism, and applications of biodegradable polymer poly(1,4-butylene adipate) (PBA) and its blends with poly(vinyl chloride) (PVC). In the first part, using pure PBA at a melting temperature (Tmax) of 150 °C, it was observed that PBA exhibited a ring-banded spherulitic morphology within the crystallization temperature (Tc) range of 29 °C to 33 °C. Among these temperatures, the most regular rings were observed at Tc = 32 °C. Below 29 °C and above 33 °C, dendritic spherulites were formed. To create artificial ring-banded spherulites, Tc = 32 °C, exhibiting the most regular ring-banded morphology, and Tc = 40 °C, exhibiting a dendritic morphology were used. These spherulites were observed using POM. Photonic iridescence properties were also used to analysis. SEM was then utilized to observe the top surface and internal lamellae arrangements. The irregularly shaped protrusions on the top surface formed ridges of ring-band, while the flat regions were valleys. To establish a reasonable growth mechanism, synchrotron microbeam WAXD and SAXS were used to construct a complete three-dimensional model of the spherulites. In the second part, thin film samples of PBA/PVC (80/20) were crystallized at different temperatures and observed using POM and SEM. At the Tc ranging from 38 °C to 42 °C, feather-like spherulites were observed at the core of the spherulites. As the Tc increased, these feather-like spherulites became smaller. Synchrotron microbeam WAXD and SAXS were also employed to establish a reasonable growth mechanism of the spherulites.

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