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Analysis of the effect of experimental parameters on the morphology of electrospun polyethylene oxide nanofibres and on their thermal properties

机译:实验参数对电纺聚环氧乙烷纳米纤维形态及其热性能的影响分析

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摘要

Electrospinning is a new and simple method of producing nanofibres by introducing electric field into polymer solutions. We perform an experimental investigation on the influence of processing parameters and solution properties on the structural morphology and average fibre diameter of electrospun polyethylene oxide (PEO) polymer solution and on their thermal properties. Experimental trials have been conducted to investigate the effect of solution parameters, such as concentration, addition of ethanol in PEO solution, solvent effect, as well as governing parameters, such as applied voltage, collection distance and flow rate. At higher concentrations, the nanofibres with regular morphology and, on average, uniform fibre diameter were obtained, and at lower concentrations of PEO polymer solution, the fibres showed irregular morphology with large variations in fibre diameter. We also found that the addition of ethanol increased the fibre diameter and produced bead-free fibres. Applied voltage, collection distance and flow rate also influence fibre morphology. To analyse the thermal properties of the fibres produced from the PEO powder and the electrospun nanofibres produced from the two polymer solutions (PEO + water and PEO + water/ethanol), differential scanning calorimetry (DSC) was used, and to determine the degree of crystallinity, X-ray diffraction technique has been used.
机译:电纺丝是通过将电场引入聚合物溶液中来生产纳米纤维的一种新的简单方法。我们对工艺参数和溶液性质对电纺聚环氧乙烷(PEO)聚合物溶液的结构形态和平均纤维直径及其热性质的影响进行实验研究。已经进行了实验试验以研究溶液参数的影响,例如浓度,在PEO溶液中添加乙醇,溶剂的作用以及控制参数,例如施加的电压,收集距离和流速。在较高浓度下,获得具有规则形态且平均而言纤维直径均匀的纳米纤维,而在较低浓度的PEO聚合物溶液中,纤维表现出不规则形态,纤维直径变化较大。我们还发现添加乙醇会增加纤维直径并产生无珠的纤维。施加的电压,收集距离和流速也会影响纤维的形态。为了分析由PEO粉末生产的纤维和由两种聚合物溶液(PEO +水和PEO +水/乙醇)生产的电纺纳米纤维的热性能,使用差示扫描量热法(DSC)并确定其程度。对于结晶度,已经使用了X射线衍射技术。

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