Pant H R, Bajgai M P, Yi C, et al. Effect of successive electrospinning and the strength of hydrogen bond on the morphology of electrospun nylon-6 nanofibers [J]. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2010, 370(1): 87-94.

摘要的层次

• We demonstrate for the first time herein that the successive electrospinning can change the fiber morphology in the electrospun mat of the polymer at the same electrospinning parameters.
  做了什么：第一次说明了相同参数下连续纺丝对形貌影响
• Two types offibers (nano and sub-nano size) arranged in a spider-net like structure were obtained from the singlepolymer nylon-6 by electrospinning.
  实验内容
• FE-SEM images of the mats at different applied voltage showed thatthis network consisted of thin nanofibers with diameters of about 8–29nm and thick nanofibers withdiameters of about 80–292nm, arranged in a spider-net like structure. **The successive electrospinning sufficiently decreased the diameter of the main nanofibers and hardly change the diameter of the thinnerfibers. **
  最突出的结果
• The study of FT-IR spectra and the conductivity of the different mats in acidic solution showed thatthe formations of spider-net structure were due to the formation of stronger hydrogen bonds betweenionized oligomer/monomer and polymer molecules.
  解释下氢键形成机理
• The possible mechanism of hydrogen bonds formation during electrospinning was proposed. These spider-net structures with high aspect ratio wereresponsible to increase the mechanical strength of nylon-6 mat.
  结论：氢键，&用途

简介部份

• 说明电压影响，此外连续纺丝影响
• 没人解释氢键机理，我来解释

实验部分

浓度：22 wt%，距离：18 cm，电压：12，22，32kv，m12，m22，m32. m12溶解了为sm1，再溶解纺丝，sm2

结果和讨论

• 电压是关键哪，亲
  12 kv下没有，且纤维不光滑。增加电压就有了。
• 作为支撑上面结论，用电导率变化来说明
  高电压，聚合物电离更多。
• 但好像电压太高也不对
  32 kv反而减少了nano-web，且松散连接在主纤维。而且主纤维变扁了。
• 多次纺丝后纤维直径下降
  The average fiber diameter of m22, sm1 and sm2 mat were found to be 228, 102 and 52 nm, respectively.
• 紫外实物图
  低聚/单体产生，溶液变成棕色。分子量下降对应纤维变细。
• 氢键&结晶改变

1. amide II at 1545 cm−1随着电压升高移动，说明有氢键，m22氢键最强。
2. � γ 相 of m22 mat 709 移动为 sm1的690 α 相。连续纺丝后α相
3. 21.4◦ which represents the �γ phase, 16.6◦( �α phase)
4. TGA 不同晶型不同Tg。

结论

• The goal of this investigation has been to build a basis to study
  more complicated structures in sub-nanoscale of biocompatible
  polymers in order to better understand the effect of the electrospinning process on fiber morphology.
  本文主要目的了解连续纺丝对形貌影响
• Other polymers whichare polyelectrolytic in nature may also form spider-net like structure.
  提到其他也可以，普适。
• Furthermore, we except that the polymers used in biomedical application on functionalization by the atoms/group of atoms capable to form hydrogen bond, may also be able to give spider-netlike structures which may be potential in bioengineering field likeas drug and gene delivery.
• In this work, the obtained nanofibersmat of nylon-6 as the function of applied voltage has to be foundmore surface to volume ratio with higher mechanical strength.
  重复了一次电压很重要的
• In this work, the obtained nanofibersmat of nylon-6 as the function of applied voltage has to be foundmore surface to volume ratio with higher mechanical strength.
  连续纺丝，打开了新世界大门。