By Zhong, Wen
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Additional info for An introduction to healthcare and medical textiles
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. Its hydrophobic nature and low moisture absorption can cause static buildup. An inert material, polyester fibers have found applications in medical and healthcare products for internal uses, such as nonabsorbable suture, vascular grafts and ligament prostheses.
More importantly, it is the only approach capable of producing filaments from a large variety of natural and synthetic polymers. For this reason, electrospun nanofibers will be the focus of the rest of this chapter. 2. BIOPOLYMERS USED FOR NANOFIBERS A wide range of biopolymers, both natural and synthetic, have successfully been electrospun into nanofibers. , without having to be mechanically removed; see Chapter 5). Some of the widely used biopolymers will be discussed in this section. 1. , cellulose and its derivatives, chitin/chitosan, and hyaluronic acid).
6. α-helix keratin (polypeptide) polymer. 7. The pleated β-sheet structure. mer chains to pack so tightly that the silk fiber is high in terms of its crystalline regions (70–75%), and low in amorphous regions (25–30%). The surface of silk fibers is covered with a layer of sericin, also referred to as silk gum. Most of the gum on the fiber surface is removed to allow further textile processing procedures. Silk is a hydrophilic fiber. , acceptance of an artificial implant by the surrounding tissues and by the body as a whole.