By Zhong, Wen
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Additional info for An introduction to healthcare and medical textiles
However, the polymer chains are highly aligned along the fiber axis, even in the amorphous region. The polymers are also bonded together by strong intermolecular forces. As a result, polyester fibers have high mechanical strength, toughness and abrasion resistance, as well as high elongation and elastic recovery. However, polyester fibers require higher forces to elongate as compared to nylon fibers. They also have higher resistance to heat and chemicals (including acids and oxidizing agents) than nylon fibers.
Low-twist yarns usually have 15–30 tpc, moderate-twist yarns 50–65 tpc, while high-twist yarns have 100–200 tpc. The degree of twist can affect mechanical strength: for spun yarns, an increase in the degree of twist can increase its strength at first, as increased friction among fibers causes the yarn strength to increase; however, if the degree of twist goes beyond a certain value, the fibers in the yarn will start to crush on each other and bring down its strength. For filament yarns, the yarn strength remains constant until the degree of twist reaches a critical value, at which point the strength starts to decrease.
8. , sutures) applications. 8. Nylon 6 and Nylon 6,6. 9. Polyethylene terephthalate (PET). , tire cord, hoses, conveyer and seat belts, ropes and nets). Polyester fibers consist of “long-chain polymers composed of at least 85% by weight of an ester of a substituted aromatic carboxylic acid” (FTC, 1958). 9) accounts for 95% of the polyester fibers produced, and is also the most widely used synthetic fiber in the world. Polyester fibers are 35% crystalline and 65% amorphous (Hatch 1993). However, the polymer chains are highly aligned along the fiber axis, even in the amorphous region.