本研究以共同電紡絲之方式，製備聚對苯二甲酸丁二酯/同排聚丙烯(PBT/iPP)複合纖維膜。藉由同時電紡10 wt% PBT/TFA溶液以及8 wt% iPP/o-DCB/0.5 wt% Bu4NClO4溶液，並將兩溶液之流量皆控制為1 mL/h，根據密度換算，可得複合纖維膜中iPP理論含量為40.89%。由於iPP不溶於PBT之溶劑三氟乙酸，藉由三氟乙酸處理複合纖維膜，可得實際iPP含量為41 wt%。

吾人以SEM、DSC及X光散射等儀器研究複合纖維膜之表面結構以及其結晶性質。電紡iPP纖維及PBT纖維具有不同之表面結構。當PBT纖維及iPP纖維以59：41之比例混合，形成複合纖維膜時，PBT可有效提升iPP之結晶溫度，約14.5 oC。複合纖維膜中之iPP，其結晶速率較普通之iPP纖維快，且成核機制亦有所不同。有趣的是，當PBT纖維形態消失，其對於iPP之成核能力亦跟著消失，可見其纖維形態之重要性，而非PBT晶體的存在使iPP成核能力上升。

根據X光散射之實驗結果，無論PBT為何種型態，其皆使iPP形成型晶體。另外，PBT纖維誘導iPP結晶形成之lamellae排列不規則，使其SAXS 1D profile中沒有一明顯的峰代表iPP之長週期。而當PBT纖維形態消失，iPP之lamellae則可規則派列使SAXS 1D profile中之繞射峰出現，但由於此繞射峰包刮iPP及PBT晶體之繞射峰，因此無法藉此判斷此樣品中各自的長週期。

In this study, PBT/iPP nanofibers were successfully produced through electrospinning PBT solution and iPP solution simultaneously. We used a rotating metal rod with the tangent speed equaling to 264 mm/s to collect and mix the fibers. With the controlled flow rate and the solution density, the composition was calculated to be 40.89 wt% iPP and 59.11 wt% PBT. Also, we used TFA to dissolve PBT in the product, and we could get the real composition of iPP. The real composition of iPP is 41 wt%.

We used SEM, DSC, WAXD and the SAXS techniques to investigate the surface structures and the crystallization properties. With the existence of PBT fibers, the crystallization temperature of iPP increased about 14.5 oC during dynamic crystallization process. PBT fibers not only made iPP crystal grow faster, but also changed the mechanism of crystallization of iPP. Furthermore, when the fiber structure of PBT disappeared, the ability to enhance the crystallization temperature of iPP also disappeared. According to this result, we got the conclusion that the fiber structure of PBT is important for the nucleating ability.

Through WAXD and SAXS techniques, we concluded that PBT only made iPP form the  phase, regardless of the structure of PBT. On the other hand, when PBT fibers existed, iPP didn’t form the lamella stacking. After the fiber forom disappeared, the lamella stacking of iPP took place.

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