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Preparation of hollow polyurethane microspheres with tunable surface structures via electrospraying technology

机译：通过电喷雾技术制备具有可调表面结构的空心聚氨酯微球

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A facile one-step electrospraying technology was utilized to produce a novel kind of hollow polyurethane (PU) microspheres with controlled size and tunable surface morphology by adjusting the experiment parameters such as solvent, flow rate, applied voltage, and solution concentration. A porous-hollow structure can be obtained by increasing flow rate or solution concentration, or decreasing applied voltage. The decrease of flow rate or solution concentration, or the increase of applied voltage leads to hollow structures with a non-porous surface. The formation of porous-hollow morphology involves the PU polymer chains deposition during the solvent evaporation process and a phase separation phenomenon induced by the anti-solvent behavior in the water bath. The results demonstrate that the electrospraying method is a novel and facile method for preparing hollow polymer microspheres with tunable surface structures, and the obtained PU microspheres offer diversified applications ranging from adsorbents to drug delivery systems.
机译：通过调整实验参数，例如溶剂，流速，施加的电压和溶液的浓度，利用一种简便的一步电喷雾技术来生产一种新型的中空聚氨酯（PU）微球，其尺寸可控且表面形态可调。可以通过增加流速或溶液浓度或降低施加的电压来获得多孔空心结构。流速或溶液浓度的降低，或施加电压的增加会导致具有无孔表面的空心结构。多孔中空形态的形成涉及溶剂蒸发过程中PU聚合物链的沉积以及水浴中反溶剂行为引起的相分离现象。结果表明，电喷雾法是制备具有可调表面结构的中空聚合物微球的简便方法，所得的PU微球具有广泛的应用范围，从吸附剂到药物输送系统。

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