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.

摘要的層次

• 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：第一次說(shuō)明了相同參數(shù)下連續(xù)紡絲對(duì)形貌影響
• Two types offibers (nano and sub-nano size) arranged in a spider-net like structure were obtained from the singlepolymer nylon-6 by electrospinning.
  實(shí)驗(yàn)內(nèi)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. **
  最突出的結(jié)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.
  解釋下氫鍵形成機(jī)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.
  結(jié)論：氫鍵，&用途

簡(jiǎn)介部份

• 說(shuō)明電壓影響，此外連續(xù)紡絲影響
• 沒(méi)人解釋氫鍵機(jī)理，我來(lái)解釋

實(shí)驗(yàn)部分

濃度：22 wt%，距離：18 cm，電壓：12，22，32kv，m12，m22，m32. m12溶解了為sm1，再溶解紡絲，sm2

結(jié)果和討論

• 電壓是關(guān)鍵哪，親
  12 kv下沒(méi)有，且纖維不光滑。增加電壓就有了。
• 作為支撐上面結(jié)論，用電導(dǎo)率變化來(lái)說(shuō)明
  高電壓，聚合物電離更多。
• 但好像電壓太高也不對(duì)
  32 kv反而減少了nano-web，且松散連接在主纖維。而且主纖維變扁了。
• 多次紡絲后纖維直徑下降
  The average fiber diameter of m22, sm1 and sm2 mat were found to be 228, 102 and 52 nm, respectively.
• 紫外實(shí)物圖
  低聚/單體產(chǎn)生，溶液變成棕色。分子量下降對(duì)應(yīng)纖維變細(xì)。
• 氫鍵&結(jié)晶改變

1. amide II at 1545 cm?1隨著電壓升高移動(dòng)，說(shuō)明有氫鍵，m22氫鍵最強(qiáng)。
2. ? γ 相 of m22 mat 709 移動(dòng)為 sm1的690 α 相。連續(xù)紡絲后α相
3. 21.4? which represents the ?γ phase, 16.6?( ?α phase)
4. TGA 不同晶型不同Tg。

結(jié)論

• 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.
  本文主要目的了解連續(xù)紡絲對(duì)形貌影響
• Other polymers whichare polyelectrolytic in nature may also form spider-net like structure.
  提到其他也可以，普適。
• 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.
  重復(fù)了一次電壓很重要的
• 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.
  連續(xù)紡絲，打開(kāi)了新世界大門(mén)。