【摘要】 本文在丙酮、乙酸、丙酮/乙酸(体积比为2∶1)三种溶剂体系下静电纺醋酸纤维素(CA)。研究了溶剂组成、溶液的黏度、表面张力、电导率、浓度对纤维形貌和平均直径的影响。用扫描电镜分析表征纤维的形貌和直径。研究结果表明:单独以丙酮或乙酸为溶剂静电纺CA都不能连续得到光滑纤维。在丙酮/乙酸(体积比为2∶1)溶剂体系下,CA质量分数为10%-12%时可连续得到无串珠纳米纤维。溶液在一定的黏度范围才具有可纺性,黏度越大串珠数量越少,纤维越光滑。纤维的直径随着CA浓度的增大而增大。溶液电导率的增加引起纤维直径的减小。改变溶液的组成,纤维的直径可以从1.2μm变化到400nm。更多还原

【Abstract】 Cellulose acetate(CA) was electrospun in acetic acid,acetone and acetic acid /acetone(V∶V=2∶1) through eletrospinning technique.The effects of solvent,solution viscosity,surface tension,conductivity and concentration on fiber morphological appearance and diameter were systematically investigated by Scanning Electron Microscopy(SEM).The result showed that: smooth and continuous CA nanofibers could not be prepared in acetic acid and acetone solution.The acetic acid /acetone(V∶V=2∶1) was the most versatile mixture because it allowed CA in 10 wt% and 12 wt% concentration to be continuously electrospun into smooth nanofibers.Viscosity was found to has a greatest effect on fiber morphological appearance.Solutions with enough viscosities were necessary to produce bead.With solution concentration increase,beads decreased.The increasing of solution conductivity resulted in fiber diameter decreasing.The average diameters of the CA nanofibers could be controlled from 1μm to 400nm by changing the composition of solution.更多还原