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首页> 外文期刊>Journal of Applied Polymer Science >Mechanical and structural characterizations of simultaneously aligned and heat treated PAN nanofibers
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Mechanical and structural characterizations of simultaneously aligned and heat treated PAN nanofibers

机译：同时排列和热处理的PAN纳米纤维的机械和结构表征

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摘要

A simple and nonconventional electrospinning technique was employed for producing aligned polyacrylonitrile (PAN) nanofibers. A thermal zone was placed between syringe needles and collector in the electrospinning set up to obtain aligned and heat treated nanofibers. Suitable temperatures for heat treat process of PAN nanofibers was determined using differential scanning spectroscopy (DSC) technique. The influence of treatment temperature was investigated on morphology, internal structure and mechanical properties of collected PAN nanofibers. The average fiber diameter measured from SEM images exhibited decreasing trend at higher temperatures. FTIR spectra indicated no considerable difference between chemical structure of untreated and treated PAN nanofibers. Crystallization degree of PAN nanofibers calculated from WAXD patterns showed relatively low change with treatment temperature. Tenacity values of nanofiber bundles increased with increasing temperature while the extension values had an inverse trend. However, the modulus did not show a regular manner, but treated nanofibers had more modulus than untreated ones. The stress and modulus of PAN nanofibers increased to 112.9 MPa and 7.25 GPa at 270°C, respectively. Nanofibers treated at the highest temperature had the largest amount of crystallinity and strength.
机译：一种简单而非常规的静电纺丝技术被用于生产取向聚丙烯腈（PAN）纳米纤维。在静电纺丝装置中，将热区放置在注射器针头和收集器之间，以获得对齐并经过热处理的纳米纤维。使用差示扫描光谱法（DSC）技术确定了PAN纳米纤维热处理工艺的合适温度。研究了处理温度对收集的PAN纳米纤维的形态，内部结构和力学性能的影响。由SEM图像测得的平均纤维直径在较高温度下表现出下降趋势。 FTIR光谱表明，未处理和已处理的PAN纳米纤维的化学结构之间没有显着差异。由WAXD图计算出的PAN纳米纤维的结晶度随处理温度的变化相对较低。纳米纤维束的强度值随温度升高而增加，而延伸值则呈反趋势。然而，模量没有显示出规则的方式，但是处理后的纳米纤维比未处理的纤维具有更多的模量。 PAN纳米纤维在270°C时的应力和模量分别增加到112.9 MPa和7.25 GPa。在最高温度下处理的纳米纤维具有最大的结晶度和强度。

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