本研究集中在聚羥基丁酸共羥基戊酸(PHBV)雙環帶球晶的內部結構，利用偏光顯微鏡(Polarized Optical Microscopy，POM)、掃描式電子顯微鏡(Scanning Electron Microscopy，SEM)和微分掃描熱卡計(Different Scanning Calorimeter，DSC)、來探討兩成份摻合系統聚羥基丁酸酯共聚羥基戊酸酯(PHBV)/聚乙烯基甲基醚(PVME)之球晶形貌、晶板微結構進行光學性質的分析，及其相對應之內部晶板排列進行觀察與分析。首先將PHBV/PVME以固定的熔融溫度(Tmax)與熔融時間(tmax)消除其熱歷史，再降至特定的結晶溫度，並且作連續的升溫或降溫(Tc=100 ˚C to 60 ˚C with cooling rate = -1.5 ˚C/min or Tc = 60 ˚C to 90 ˚C with heating rate = 2 ˚C/min)，以及特定溫度等溫結晶觀察球晶形貌。在POM觀察下，PHBV/PVME（75/25）4wt％呈現雙環帶(double ring-banded)狀形態，橙色和藍色帶在很寬的溫度範圍（60至100 ˚C）沿徑向交替排列。然而，球晶上的環形圖案的帶間距和不規則性隨著Tc改變，從高Tc處的環帶間距較大且形狀不規則環變化到低Tc處環帶間距較小且形狀規則環。在SEM的內部結構觀察下，分析不同結晶溫度(Tc)對於PHBV球晶的影響，比較內部結構與上表面的環帶狀圖案的相關性並分析可能的形成機理。

This study has focused on the interior structure of poly(3-hydroxybutyric acid-co-3-hydroxyvaleric acid) (PHBV) double ring-banded spherulites. PHBV was crystallized in the presence of poly(vinyl methyl ether) (PVME) to study the growth mechanism of PHBV in the mixture. The lamellar assembly of PHBV spherulites in the blend with amorphous poly(vinyl methyl ether) (PVME) has been examined to elaborate the formation mechanisms of banded PHBV spherulites in the non-isothermal and isothermal crystallization process. The behavior of PHBV spherulites by continuously heating/cooling and specific isothermal crystallization temperatures (Tcs) was recorded and analyzed by using polarized optical microscopy (POM) and scanning electron microscopy (SEM). Under POM observation, PHBV/PVME (75/25) 4wt% exhibits double-ring banded morphology with both orange and blue color bands alternatingly arranged along radial direction at a wide temperature range (60 to 100 ˚C). However, the band spacing and irregularity of the ring patterns on spherulites vary accordingly with Tc from wider-irregular rings at high Tc into slimmer-regular rings at low Tc. Correlations between crystallization temperatures(Tcs) and internal lamellar ring-banded patterns were collected and analyzed for possible formation mechanisms.

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