添加无机盐，静电纺丝新策略

Barakat N A, Kanjwal M A, Sheikh F A, et al. Spider-net within the N6, PVA and PU electrospun nanofiber mats using salt addition: novel strategy in the electrospinning process [J]. Polymer, 2009, 50(18): 4389-4396.

摘要思路

• Electrospun nanofibers are promising candidates in the nanotechnological applications due to theadvantages of the nanofibrous morphology. Therefore, many attempts were reported to modify theelectrospun mats to gain more beneficial properties.
  白话句背景，修改纺丝很重要。
• In the present study, we are introducing a strategyto synthesize electrospun polymeric nanofiber mats containing spider-net binding the main nanofibers.Addition with long stirring time of a metallic salt having tendency to ionize rather than formation of sol–gel in the host polymer solution reveals to synthesize a spider-net within the electrospun nanofibers ofthe utilized polymer.
  我们添加了金属盐
• Nylon6, polyurethane and poly(vinyl alcohol) have been utilized; NaCl, KBr, CaCl2 and H2PtCl6 have been added to the polymeric solutions.
  哪几种物质哪几种盐，开始展开细节。
• In the case of nylon6 and poly(vinyl alcohol),addition of the inorganic salts resulted in the formation of multi-layers spider-network within theelectrospun nanofibers mats.
  PA 6和PVA加无机盐会有多层纳米蛛网
• The synthesized spider-nets were almost independent on the nature of thesalt; the optimum salt concentration was 1.5 wt%.
  最佳盐浓度1.5 wt%
• The metallic acid led to form trivial spider-nets within both of nylon6 and poly(vinyl alcohol) nanofibers.
  金属盐细小的网
• In a case of polyurethane, few spider-nets wereformed after salt addition due to the low polarity of the utilized solvents.
  聚氨酯因为溶剂难的形成蛛网。
• ethane, few spider-nets wereformed after salt addition due to the low polarity of the utilized solvents. According to TEM analysis, thesynthesized spider-net consisted of joints; the later issued from the main nanofibers at Taylor’s conezone. The spider-net improved the mechanical properties and the wetability of the nylon6 nanofibermats, accordingly a mat having amphiphilic feature has been prepared.

简介部份

• 没有人修改纤维内部结构来改善纺丝性能
• 离子盐对形貌的影响

实验部分

N6 22 wt%，甲酸/醋酸，4：1。盐：0.5，1，1.5，2 and 2.5 wt%。
溶解时间：0.5，3 and 24 h。20kv，15cm。

结果讨论

盐的种类

• NaCl, KBr, and CaCl2，1.5 wt%。many spider-net layers
• 金属盐和无机盐比微不足道

溶液影响

• 无机盐和酸反应，加速溶解，N6是化学溶解，PVA物理溶解。
• 聚氨酯溶液的THF/DMF不溶解无机盐

蛛网的直径

• almost 15 nm in both salts

盐的浓度

• 金属盐对N 6 影响不大
• 2.5 wt%盐浓度microballs微球

搅拌时间，盐浓度1.5 wt%

• 0.5 h没有蛛网，还能看到盐在纤维上。3h有一点蛛网，24h大量蛛网。对PVA
• 0.5 h有蛛网，但能看到盐。N 6化学溶解

机理解释

机理图.png

应用

• 更亲水

结论

• An internal modification of the polymeric electrospun nanofibermats can be achieved by addition of strong ionic salt to the polymer solution. Ionization of the salt in the polymer solution results in the formation of spider-net within the main nanofibers during the electrospinning process.
  一句话概括文章：添加无机盐改变聚合物纤维形成纳米蛛网
• The formed spider-net mainly depends on the ionization ability of the used salt.
  形成蛛网和盐的种类很有关
• The spider-net affects the general properties of the electrospun mat.
  蛛网结构能够影响纤维性质
• Finally, the obtained results indicated that the proposed strategy can be generalized to be applicable with many polymers especially those are soluble in polar solvents.
  这种策略潜在应用再能溶解在极性溶剂聚合物