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