聚(3-羥基丁酸酯)/聚乙二醇摻混於電紡纖維中之相行為

本研究將兩種半結晶高分子：聚(3-羥基丁酸酯) (PHB)與不同分子量之聚乙二醇(PEG)，於70/30之重量比下摻混，經由電紡製程製備成不織布纖維。藉由摻混不同分子量的聚乙二醇，探討摻混系統中，高分子在奈米纖維中鏈排列的結晶型態與相分離的情形，並對照類似系統於溶鑄法成膜時的行為討論之。電紡絲製程的特殊效應：溶劑快速揮發、外加電場的應力效應與細小纖維直徑的限制。本研究藉由微差式掃描熱卡計(Differential scanning calorimetry, DSC) 來探討摻混系統中熱性質的變化；以廣角X光散射儀 (Wide angle x-ray scattering, WAXS) 與小角X光散射儀 (Small-angle X-ray scattering, SAXS) 用來探討結晶結構之型態與晶板層間的變化。本研究發現，添加小分子的PEG可以促進PHB結晶在較低的溫度達到熔融。具相容性的PHB/PEG系統，PEG會在PHB結晶過程中，排列在結晶晶板結構中，增加了PHB結晶層板的厚度；介於中間分子量的PEG4000，則會因為在室溫下亞穩態結晶的能力，導致其對PHB結晶層板厚度的提升最不明顯。電紡絲的快速溶劑揮發行為，致使PHB結晶排列具有一致性，對於PEG所造成的層板增厚行為，也有所限制，因此，PEG對於PHB結晶層板的增厚行為，在電紡絲中並不明顯，也不受於PEG分子量不同的影響。

關鍵字

聚(3-羥基丁酸酯) ；聚乙二醇；摻混；微差式掃描熱卡計；廣角X光散射儀；小角X光散射儀

並列摘要

Electrospun fibers with the blends of poly(3-hydroxybutyrate) (PHB) and poly(ethylene glycol) (PEG) of various molecular weights in a weight ratio of 70/30 were fabricated. The aim of this study is to compare the difference between electrospinning and casting for PHB/PEG blended system with various molecular weight of PEG. The special effects of electrospinning, such as the fast solvent evaporation, stress on the fibers due to electric field, and fiber size limitation, could affect the polymer chain packing, phase separation, partially mixed amorphous phase, and crystallinity of the blends of PHB/PEG. For those polymer blends, the thermal properties were observed by differential scanning calorimetry (DSC), and the crystalline behaviors were characterized by wild-angle X-ray scattering (WAXS) and small-angle X-ray scattering (SAXS). The DSC results indicated that the melting point of PHB shift to lower temperature due to the high mobility of PEG400 at higher temperature. The uniform melting peak of PHB of electrospinning membranes indicated the uniform crystalline structure of PHB due to the fast solvent evaporation and electric field. The results of SAXS could be observed the lamellae of PHB would be increased after adding of PEG due to the miscibility of PHB and PEG. However, the least amount of increased lamellae of PHB in PHB/PEG4000 could be found due to the metastable structure of PEG4000. The fast solvent evaporation in electrospinning process leaded to the uniform crystalline structure and limitation the thickness of lamellae of PHB. The amount of increased lamellae is almost the same after adding various molecular weight of PEG.

並列關鍵字

poly(3-hydroxybutyrate) ； poly(ethylene glycol) ； blend ； wild-angle X-ray scattering ； small-angle X-ray scattering

參考文獻

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聚(3-羥基丁酸酯)/聚乙二醇摻混於電紡纖維中之相行為

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