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首页> 外文学位 >Electrospinning of polycarbonate fibers with solvent mixtures THF and DMF.
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Electrospinning of polycarbonate fibers with solvent mixtures THF and DMF.

机译：聚碳酸酯纤维与溶剂混合物THF和DMF的静电纺丝。

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摘要

Electrospinning is a superior process compared to other conventional spinning methods for the production of fibers in sub-micron to nanometer diameters. Such fiber membranes have exceptionally large surface areas and small pore sizes. The process requires an electrostatic force at the surface of a polymer solution or melt, which overcomes the surface tension and viscoelastic forces to create an electrically charged jet. When the jet stream dries or solidifies, an electrically charged fiber remains, which can be directed or accelerated by the electrical forces and then collected in non-woven fiber membrane or other useful shapes. The current work demonstrates the electrospinning of polycarbonate dissolved in solvent mixtures of tetrahydrofuran and dimethylformamide to obtain fibers on the nanoscale. The solvent mixtures played a significant role on the morphology of the fibers. The spun fibers showed the characteristics of strong networking to each other as the THF ratio was raised in the solvent mixtures (such as 60:40, 70:30 of THF: DMF). The electrostatic voltage, viscosity and surface tension also had major effects on the fiber morphology and formation of beads. At lower THF and DMF ratios and lower spinning voltages, the bead revealed a globular mushroom shape, while at higher ratios and higher voltages, the beads formed the shape of a spindle. The microstructures of the electrospun polycarbonate fibers were quantitively investigated by Scanning Electron Microscope (SEM) and Transmission Electron Microscope as a function of processing variables.
机译：与用于生产亚微米至纳米直径的纤维的其他常规纺丝方法相比，电纺丝是一种优越的工艺。这种纤维膜具有特别大的表面积和小的孔径。该方法需要在聚合物溶液或熔体表面施加静电力，该静电力可克服表面张力和粘弹性力以产生带电射流。当喷射流干燥或固化时，带电的纤维会保留下来，带电的纤维可以通过电力引导或加速，然后以无纺纤维膜或其他有用的形状收集。目前的工作表明，将溶于四氢呋喃和二甲基甲酰胺的溶剂混合物中的聚碳酸酯进行静电纺丝，可得到纳米级的纤维。溶剂混合物对纤维的形态起重要作用。随着溶剂混合物中THF比率的提高（例如THF：DMF的60：40、70：30），纺出的纤维表现出彼此牢固的网络连接特性。静电电压，粘度和表面张力也对纤维形态和珠粒形成有重要影响。在较低的THF和DMF比和较低的纺丝电压下，珠粒呈球形蘑菇状，而在较高的比例和较高电压下，珠粒呈纺锤形。静电纺丝聚碳酸酯纤维的微观结构通过扫描电子显微镜（SEM）和透射电子显微镜作为加工变量的函数进行了定量研究。

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  • 作者

    Shawon, Jamila.;

  • 作者单位

    University of Massachusetts Lowell.;

  • 授予单位 University of Massachusetts Lowell.;
  • 学科 Plastics Technology.
  • 学位 M.S.Eng.
  • 年度 2003
  • 页码 99 p.
  • 总页数 99
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 整形外科学（修复外科学）;
  • 关键词

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