Abstract
Abstract Complex nature of tensile deformation of oriented nylon 6 fibers was investigated by broad-line NMR and IR methods. The first method was used for evaluation of a length distribution function for tie chains in amorphous regions of microfibrils and the second one-for chain scission detection. On the base of these results the stress-strain diagram and the elastic modulus dependence on deformation were calculated theoretically for an idealized model of polymer structure. From comparison between the theoretical curves and experimental ones the conclusion was drawn that deformation of fibers is due not only to stretching of tie chains in amorphous regions but to intermolecular interaction also. High values of modulus at small deformations were explained by existence of a rigid framework caused by interfibrillar interaction. External tensile load will be distributed between tie chains in amorphous regions only after destruction of this framework. Strength of the framework were estimated approximately as 70 MPa.
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