本研究使用三氟乙酸為溶劑，以電紡法製備奈米直徑聚對苯二甲酸丁二酯(PBT)纖維，探討電紡不同黏度(ηo)溶液時，Taylor cone、液柱長度、液柱直徑(dj)及纖維直徑(df)的變化，透過液柱直徑及纖維直徑對溶液黏度做全對數圖可得scaling law關係：dj~ηo0.06與df~ηo0.73。相較於相同操作條件下電紡聚對苯二甲酸乙二酯(PET)溶液，結果顯示在相同溶液黏度，電紡PBT溶液所得液柱直徑較電紡PET溶液粗，但所得纖維直徑較細。

以偏光顯微鏡在全偏光模式下觀察電紡聚對苯二甲酸丙二酯 (PTT)與PBT所得纖維誘發聚丙烯在纖維表面上形成穿晶之過程，並分析其穿透光強度變化，藉由穿透光強度會隨晶核增加上升的關係，可得晶核在纖維表面出現的初始溫度(Ti)。比較同為聚酯類高分子之PET、PTT及PBT纖維誘發聚丙烯在纖維表面上之成核能力，結果顯示PBT纖維誘發聚丙烯的成核能力遠優於其他兩種，成核能力的順序依次為PBT＞PET＞PTT。

有限元素分析法分析球/平板電極系統之電場分布，結果顯示球電極的直徑越小，球頂表面所產生的電場強度越大。球電極頂端之電場強度 (E/Eo)對球電極直徑(d)做全對數圖可得scaling law關係；3D軸對稱：E/Eo~d-1.00，2D平面座標：E/Eo~d-0.78。將上述所得結果與圓柱/平板電極系統相比，結果顯示球/平板電極系統所得之電場強度大於圓柱/平板電極系統，但電場的衰退幅度較大。增加球電極數目為三個，發現兩側球電極的電場強度較中間球大，增加球電極間距時，中間球頂電極至平板間電場衰退幅度降低，在三圓柱/平板電極系統亦有相同趨勢。

Electrospun polybutylene terephthalate (PBT) nanofibers were prepared from a trifluoroacetic acid (TFA)-based solvent. The effects of solution viscosity (ηo) on Taylor cone, jet length, jet diameter (dj) and fiber diameter (df) were investigated. The double-logarithmic plots of jet and fiber diameters versus the zero-shear viscosity (ηo) revealed that two scaling laws existed for the present solution, i.e., dj~ηo0.06 and df~ηo0.73. We compared the electrospinning of PBT/TFA solutions with that of PET/TFA solutions under the same conditions. It showed that under the same solution viscosity, the jet diameter of PBT/TFA solution is larger than that of PET solution. However, the diameter of electrospun PBT fibers is smaller.

Transcrystallization of isotactic polypropylene (iPP) on as-apun PTT and PBT fibers was investigated by polarized optical microscopy. By measuring the transmitted light intensity under cross-polarized configuration, the induction temperature (Ti) for iPP transcrystallization was determined. We compared the nucleating ability of electrospun PET、PTT and PBT fibers that induced the transcrystallization of iPP. The nucleating ability of PBT fibers was much better than the others. The nucleating ability of fibers could be ranked as follows：PBT > PET > PTT.

The electric field distribution of ball/plate electrode configuration was calculated by finite element analysis. Decreasing the diameters of ball electrode led to an increasing in the electric field at the top surface of ball electrode. The double-logarithmic plots of electric field at ball top versus the ball diameter (d) revealed that two scaling laws, i.e., 3D axisymmetric：E/Eo~d-1.00 and 2D plane：E/Eo~d-0.78. It was found that the electric field intensity of ball/plate electrode configuration was stronger than cylinder/plate electrode configuration, but the decay of electric field intensity became larger. As the numbers of ball electrode increased from one to three, the electric field intensity at both side balls were stronger than that of the middle one. As the separation of ball electrode was increased, the electric field decay between the middle ball and collecting plate became smaller. A similar tendency was found for the cylinder/plate electrode configuration.

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