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Structure and morphology of regenerated silk nano-fibers produced by electrospinning.

机译：通过静电纺丝生产的再生丝纳米纤维的结构和形态。

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摘要

The impressive physical and mechanical properties of natural silk fibers{dollar}sp1{dollar} and the possibility of producing these proteins using biotechnology,{dollar}sp2{dollar} have provided the impetus for recent efforts in both the biosynthesis{dollar}sp{lcub}3,4{rcub}{dollar} and the spinning of these protein based biopolymers.{dollar}sp{lcub}5,6,7{rcub}{dollar} The question still remains: whether fibers spun from solutions with similar chemical makeup can produce fibers with similar structures and therefore with the possibility of improved properties.; Since genetically engineered silk solutions were not readily available, the first objective of this project was to completely dissolve the Bombyx mori cocoon and the Nephila clavipes dragline silk while maintaining the molecular weight integrity of the polymer. The second objective was to develop a system for re-spinning from very small amount of the resulting silk solutions by the process of electrospinning. The third objective was, to produce regenerated silk fibers with diameters that are several orders of magnitude smaller than the original fibers, suitable for direct observation and analysis by transmission electron microscopy and electron diffraction. And finally, to compare these results to structural information obtained from natural (as spun by the organism) fibers to see if the regenerated solutions are able to form the same structure as the original fibers.; Both types of silk fibers were successfully dissolved while maintaining the polymer integrity. Small quantities (25-50 {dollar}mu{dollar}l) of these solutions were used to electrospin fibers with diameters ranging from 8nm-200nm. The fibers were observed by optical, scanning electron, and transmission electron microscopy. These nano fibers showed optical retardation, appeared to have a circular cross-section, and were dimensionally stable at temperatures above 280{dollar}spcirc{dollar}C. Electron diffraction patterns of annealed electrospun fibers of B. mori and N. clavipes showed reflections, demonstrating orientational and semicrystalline order in the material comparable to natural silk.; In addition, electron diffraction was also obtained form extended microtomed single dragline fibers of N. clavipes, and the d-spacings agreed well with thoes obtained from WAXD of dragline fiber bundles.
机译：天然丝纤维{dol} sp1 {dollar}令人印象深刻的物理和机械性能，以及利用生物技术生产这些蛋白质的可能性{dollar} sp2 {dollar}，为近期在生物合成{dollar} sp { lcub} 3,4 {rcub} {dollar}以及这些基于蛋白质的生物聚合物的纺丝。{dollar} sp {lcub} 5,6,7 {rcub} {dollar}仍然存在一个问题：纤维是否从具有类似溶液的溶液中纺出化学组成可以生产具有相似结构的纤维，因此具有改善性能的可能性。由于基因工程丝绸的解决方案不易获得，因此该项目的首要目标是在保持聚合物分子量完整性的同时，完全溶解家蚕茧和Nephila锁骨拉丝。第二个目标是开发一种系统，用于通过电纺丝工艺从极少量的所得丝溶液中重新纺丝。第三个目标是生产直径比原始纤维小几个数量级的再生丝纤维，适合通过透射电子显微镜和电子衍射直接观察和分析。最后，将这些结果与从天然纤维（由生物体纺丝）获得的结构信息进行比较，以查看再生溶液是否能够形成与原始纤维相同的结构。两种类型的丝纤维均能成功溶解，同时保持聚合物的完整性。这些溶液的少量（25-50美元/微升）用于电纺直径为8nm-200nm的纤维。通过光学，扫描电子和透射电子显微镜观察纤维。这些纳米纤维显示出光学延迟，看起来具有圆形横截面，并且在高于280spsp℃的温度下尺寸稳定。桑蚕和锁骨猪笼草的经退火的电纺纤维的电子衍射图谱显示出反射，表明该材料的取向和半晶顺序与天然丝相当。此外，还从延伸的锁骨猪笼草的单层拉丝纤维获得了电子衍射，并且d-间距与从拉丝纤维束的WAXD获得的离子相吻合。

著录项

  • 作者

    Zarkoob, Shahrzad.;

  • 作者单位

    The University of Akron.;

  • 授予单位 The University of Akron.;
  • 学科 Chemistry Polymer.; Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 1998
  • 页码 104 p.
  • 总页数 104
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 高分子化学（高聚物）;工程材料学;
  • 关键词

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