Behler K, Havel M, Gogotsi Y. New solvent for polyamides and its application to the electrospinning of polyamides 11 and 12 [J]. Polymer, 2007, 48(22): 6617-6621.

摘要层次

• Polyamides with long hydrocarbon chains, e.g. PA11 and PA12, are generally dissolved in phenolic or fluoric solvents that prevent these
  polymers from being electrospun and used in many applications because of their high boiling point and/or prohibitive cost.
  没有好的溶剂，限制PA11和12纺丝
• We demonstrate that a mixture of formic acid and dichloromethane can lead to the dissolution of various polyamides enabling their subsequent electrospinning. Nanofibers and nanoribbons of 130 nm and greater in average diameter were obtained and characterized using scanning electron microscopy and Raman spectroscopy.
  我们做了混合溶剂

简介

• PA11分子碳链太长不能用甲酸。
• m-cresol沸点太高不适合纺丝
• 1,1,1,3,3,3-hexafluoro-2-propanol太贵
• combine hydrophilic and hydrophobic solvents.

结果讨论

• 甲酸和DCM二氯甲烷1：1最好
• including 1/1did not dissolve the PA 6pellets.
• 实际纺丝效果
  2 wt.%to 5 wt.% using the 1/1 volume ratio of solvents.

结论

• It has been shown that the combination of FA and DCM is a new solvent for polyamides. PA11 and PA12, which are the most difficult polyamides to dissolve, were electrospun to form nanofibers and nanoribbons.
  解决了一类物质难以纺丝的大问题
• Raman spectroscopy showed a higher crystallinity of the electrospun PA11 and PA12 nanofibers as compared to the original pellets.
  结晶性变化
• The electrospun fiber diameters can be tailored from w 130 nm (2 wt.%) to over 800 nm (5 wt.%).
  得到纤维的性质