Abstract
Polyamide 66 multifilament yarns are textured in order to be endowed the properties of natural staple fibre yarns for textile applications. Texturing changes crystallinity, orientation and promotes the formation of stable secondary links between the macromolecular chains. Two polyamide yarns with the same linear density but composed of filaments of different fineness were textured by the air-jet and the false-twist procedures. The microstructural changes induced by texturing modify the relaxation behaviour of yarns. By the application of the Nutting’s power law which relates stress, strain and time, the influence of texturing and filament fineness on the relaxation behaviour of the yarns stretched form 15% to 25% was studied. Relationships between Nutting’s model parameters and crystallinity, orientation and stability of secondary crosslinks formed during texturing were also studied.
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