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首页> 外文期刊>Journal of Applied Polymer Science >Highly aligned electrospun nanofibers by elimination of the whipping motion
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Highly aligned electrospun nanofibers by elimination of the whipping motion

机译：通过消除搅打动作，高度对齐的电纺纳米纤维

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摘要

This work shows how elimination of the whipping motion of electrospinning fibers leads to nearly perfect alignment of fibers collected onto fast-rotating cylindrical collectors. The whipping motion is eliminated by using lower and more uniform electrical fields than are typically used in electrospinning practice and by pulling the fiber mechanically by the collector. Two types of polymeric fibers, solid fibers of poly(ethylene oxide) and porous fibers of polystyrene, are collected at collector surface speeds ranging from 2 to 15 m/s, showing a rapid transition from either nonaligned or wavy fibers, to straight fibers with nearly perfect alignment (over 95% of the fibers within 1° and 100% within 4°). Very high collection speeds lead to worsening of alignment, apparently because of air turbulence created by the cylinder rotation. The degree of fiber stretching is quantified as a function of the collector surface speed. A 50% decrease in average diameter is measured for PEO fibers, while for porous PS fibers; it decreases by <30% over the same range in collection speed.
机译：这项工作表明消除静电纺丝的搅打运动如何使收集到快速旋转的圆柱形收集器上的纤维几乎完全对准。通过使用比电纺丝实践中通常使用的电场更低且更均匀的电场，并通过收集器机械拉动纤维，可以消除搅动。两种类型的聚合物纤维，聚环氧乙烷的实心纤维和聚苯乙烯的多孔纤维，在收集器表面速度为2到15 m / s的范围内收集，显示出从不排列或波浪形纤维到具有几乎完美的对准（1°内95％以上的光纤和4°内100％的光纤）。极高的收集速度会导致对齐变差，这显然是由于气缸旋转产生的空气湍流。纤维拉伸程度根据集电器表面速度来量化。 PEO纤维的平均直径减少了50％，而多孔PS纤维的平均直径减少了50％。在相同的收集速度范围内，它降低了<30％。

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