连续纺丝和氢键对PA 6纳米纤维结构的影响

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。

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