Artigo

Publicado em 9 de agosto de 2017 | Por:

O truque da corda de nylon:demonstração

Kwolek também desenvolveu o truque da corda de nylon demonstração, ainda usada nas escolas de hoje!
The nylon rope trick is a scientific demonstration that illustrates some of the fundamental chemical principles of step-growth polymerization and provides students and other observers with a hands-on demonstration of the preparation of a synthetic polymer.The nylon rope trick typically makes use of a water solution of an aliphatic diamine with a solution of an aliphatic diacid chloride in a solvent that does not dissolve in water, yielding a synthetic polyamide of the nylon-type. Nylon 610 is commonly used, in which hexamethylene diamine is dissolved in water to a concentration of about 0.40 moles / deciliter. A solution of sebacoyl chloride in cyclohexane (0.15 moles / deciliter concentration) is then layered on top of the water solution, the reaction typically being conducted in a beaker. The solution is not agitated; instead the nylon 610 polymer forms as a flexible film at the interface of the water and cyclohexane layers, in an example of an interfacial polymerization.[1] The experimentalist grasps the polymer film, withdrawing it from the reaction vessel, forming a filament or rope, and collecting it on a rotating rod above the reaction vessel. New polymer forms at the interface as fresh surfaces of the cyclohexane layer and the water layer form. In this way, the demonstration yields a continuous rope that is collected on the rotating rod. Nylon 66 can also be produced at laboratory scale in this way.
The nylon rope trick: Demonstration of condensation polymerization
Paul W. Morgan and Stephanie L. Kwolek
J. Chem. Educ., 1959, 36 (4), p 182

 



Nenhum Comentário - Deixar um Comentário


Nenhum comentário.

Deixe um comentário

Você deve estar logado para postar um comentário.

Mais artigos

  • É DISSO QUE PRECISAMOS NO BRASIL : UM RUMO E MUITA LUZ !
  • A educação e o exemplo transformando vidas!
  • Reunião com o Dalton Pastore Jr atual Presidente da ESPM
  • Cursos superiores tradicionais podem ser extintos até 2030
  • Investimento na educação pública
  • Alysson Muotri: Telly Award 2018 com o vídeo sobre “mini-cérebros” em laboratório!
  • 8Voyager 2 da NASA entra no espaço interestelar
  • Antoniana Ursine Krettli : A Malária e a importância das mulheres na ciência!
  • A descoberta dos elementos químicos ao longo dos últimos 300 anos!
  • Retrospectiva Facebook 2018 Helio Dias
  • Mais artigos