本研究使用微分掃描式熱卡計(DSC)、偏光顯微鏡(POM)、掃描式電子顯微鏡(SEM)、原子力顯微鏡(AFM)以及小角度X-光散射儀(SAXS)來探討聚羥基丁酸酯共聚羥基戊酸酯(poly(3-hydroxybutyrate-co-3-hydroxyvalerate), PHBV)和聚醋酸乙烯(poly(vinyl acetate), PVAc)此兩成分摻合系統的相容性、結晶動力、球晶型態以及晶板的構造。由PHBV/PVAc於各組成皆存在單一玻璃轉移溫度，以及均相相型態，可知PHBV與PVAc為相容系統，且PHBV/PVAc系統之作用力參數為-0.32。然而，在球晶成長速率方面，相較於neat PHBV，加入PVAc以後的混摻系統其球晶成長速率會受到抑制，PHBV的球晶成長速率隨著PVAc組成增加而下降，且產生最大球晶成長速率的溫度隨PVAc組成增加往高溫移動。Neat PHBV於Tc=60~110℃時會產生具有環狀消光環的球晶(ring-banded spherulites)，然而隨著PVAc組成含量的增加，球晶消光環的規則度提高，且inter-ring spacing 會有下降的趨勢。此外，將試樣製備成塊材，觀察內部型態，可發現不論在內部抑或表面，都可產生具有消光環的球晶。更進一步的將試樣經過蝕刻的處理之後，在OM下觀察可發現，原本亮帶的部分會轉變為暗帶。而由AFM結果可知，消光環的ridge及valley處，主要分別由edge-on及flat-on的晶板構成。另外，使用不同Tmax處理試樣，在偏光顯微鏡下發現Tmax較高時，球晶成核密度會降低，球晶尺寸會變大。然而，經蝕刻之後的試樣，可發現在Tmax為190℃和220℃皆會發現在環狀帶中間都會有相反方向生長的晶板。從SAXS可以更進一步得知，PHBV和PVAc之間的排列，當Tmax較低時，晶板較厚且不定型成分(PVAc)較易進入PHBV結晶的interlamellar的區域。

Polarized-light optical microscopy (POM), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), atomic force microscopy (AFM), and small-angle X-ray scattering (SAXS) techniques were used to probe the phase behavior and crystalline morphology in blends of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) with poly(vinyl acetate) (PVAc). DSC thermal analysis and OM characterization proved that PHBV was miscible with PVAc. A small negative value of the interaction parameters (χ12= -0.32 for PHBV/PVAc blend) was obtained with the melting-point depression method. By compared with the growth rate of neat PHBV at crystallization temperature 60~100oC, those of PHBV in blends decrease with increasing PVAc contents. In addition, the growth rates of PHBV in blends of all compositions show a maximum value with respect to crystallization temperature (Tc), while Tc at which the maximum growth rate occurs is dependent on blend composition. Neat PHBV shows ring-banded spherulites at Tc = 60~110oC. However, the ring-banded patterns of PHBV in PHBV/PVAc blends crystallized at the same Tc become regular and the inter-ring spacing decreases with increasing PVAc contents. In addition, ringed textures of PHBV spherulites in blends are also observed in the fracture surface of bulk form samples. The AFM characterizations on the ring-banded spherulite of blend show that the ridge and valley regions of ring bands consist of edge-on and flat-on lamellae, respectively. A solvent-etching method was used to investigate the ring-banded spherulites of PHBV. The ridge bands of PHBV spherulites in un-etched and solvent-etched samples correspond to the bright and dark bands, respectively, under optical microscopy (OM) observation. The maximum melting temperature (Tmax) affects the morphology of the ring-banded spherulites. The spherulites of PHBV and PHBV/PVAc blends become larger after melting at higher Tmax, indicative of a decrease in nucleation density. Upon melting at a lower Tmax, the thickness of crystalline phase is thicker and PVAc is more easily located in interlamellar region compared to those melted at a higher Tmax.

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