Khajavi Ramin, Damerchely Rogheih
Islamic Azad University, South Tehran Branch, Tehran, Iran.
Pak J Biol Sci. 2007 Jan 15;10(2):314-7. doi: 10.3923/pjbs.2007.314.317.
In this study it was aimed to produce nano fibers of poly vinyl alcohol PVA polymer via electrospinning ES method and to investigate the role of PVA concentration in the spinning dope on diameter, beads and HHS of produced fibers. Spinning dopes with different concentrations of PVA at rang of 5 to 20% (wt/wt on weight of solution) prepared. The requisite voltage for ES (30 kv) was supplied by a DC high voltage power supply and for collecting the fibers a grounded aluminum foil target placed 17 cm below the tip of capillary tube (spinning nozzle). The results showed that spinning dopes with PVA concentration between 8 to 12% (wt/wt) are capable of producing PVA fibers, but those below 8% (wt/wt) concentrations because of low viscosity formed droplets known as electrospray effect. Electrospinning suppressed at spinning dope concentrations above 12% (wt/wt) due to high viscosity of dope. According to the SEM photographs of electrospun PVA fibers it revealed that in higher concentrations produced nanofibers have larger diameter with less beads and HHS in compare with lower concentrations.
本研究旨在通过静电纺丝（ES）法制备聚乙烯醇（PVA）聚合物纳米纤维，并研究纺丝原液中PVA浓度对所制备纤维的直径、珠粒和热重损失（HHS）的影响。制备了PVA浓度在5%至20%（质量/质量，基于溶液重量）范围内的不同纺丝原液。ES所需的电压（30千伏）由直流高压电源提供，为收集纤维，在毛细管（纺丝喷嘴）尖端下方17厘米处放置一个接地的铝箔靶。结果表明，PVA浓度在8%至12%（质量/质量）之间的纺丝原液能够制备PVA纤维，但浓度低于8%（质量/质量）时，由于粘度低会形成液滴，即电喷雾效应。由于原液粘度高，在纺丝原液浓度高于12%（质量/质量）时静电纺丝受到抑制。根据电纺PVA纤维的扫描电子显微镜照片显示，与较低浓度相比，较高浓度下制备的纳米纤维直径更大，珠粒和热重损失更少。
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