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Author: Admin | 2025-04-27
Arrangement embedded in amorphous material. During the drawing operation the polymer chains slide over one another as they are pulled into alignment along the longitudinal axis of the fibre. As drawing continues, more and more of the molecules are brought to a state where they can pack alongside one another into crystallites. In these regions the molecules are able to hold tightly together as a result of intermolecular forces and resist further movement with respect to one another. For instance, after nylon is spun, the filament may be drawn to as much as five times its original length before it resists further stretching. At this point the molecules are aligned as effectively as possible into crystalline regions and are holding tightly together. The filament is then able to withstand great force without further stretching. The degree of alignment of fibre molecules affects the properties of a fibre in several ways. The more closely the molecules pack together, the greater is the ultimate strength, or breaking strength, of the fibre. This increase in ultimate strength is accompanied by a decrease in the amount of elongation that the fibre can sustain before reaching its breaking point; the molecules are not able to slide over one another as they could before alignment took place. If the load becomes too great, the fibre will rupture. Because the closely packed molecules no longer have great freedom of movement, a high degree of orientation also tends to increase fibre stiffness or rigidity. Water is unable to penetrate between molecules in the crystalline region of a fibre as well as it penetrates the amorphous regions; therefore, increased alignment tends to lower the moisture absorption of the fibre. Increased resistance to water penetration in turn affects the dyeing properties of highly oriented fibres; the molecules of dyestuff cannot
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