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Structure of heat-treated Nylon 6 and 6.6 fibers. II. Recrystallization mechanism by Abigail Lisbão Simal; Adriana Regina Martin is a Materials Science article available to read on EtoBox.

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The present work compared the recrystallization process of Nylon 6 with Nylon 6.6 fibers. For such a study, the fibers were submitted to different annealing conditions (slack and restrained conditions) in a wide range of temperatures. For the structural analysis, several techniques were applied, and among them, differential scanning calorimetry (DSC) was demonstrated to be a very important tool. Nylon 6 and 6.6 fibers responded differently to the applied annealings, indicating different recrystallization mechanisms. The Nylon 6 fiber presented the formation of new and very small crystallites in their interfibrillar regions for the annealings performed above 120ЊC independently of the annealing condition. In addition to their improvement in size and perfection as the annealing temperature increases, their presence favored a general recrystallization in a preferred direction, that is, of the fiber axis. The recrystallization process of the Nylon 6.6 was commanded by the disorientation process associated to the release of the hydrogen bonds. The DSC thermograms revealed two crystalline forms, that is, of the same type but with different degrees of size and perfection. At temperatures

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Author

Abigail Lisbão Simal; Adriana Regina Martin

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0021-8995)

Published

1998

Language

EN

Field

Materials Science (Physical Sciences)