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NAPOLEON'S BUTTONS: SILK & NYLON

Saba Dowlatshahi / Lily Qian / Emma Crutcher
by

Emma Crutcher

on 17 May 2013

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Transcript of NAPOLEON'S BUTTONS: SILK & NYLON

NAPOLEON'S BUTTONS SILK The production of silk began in China. THE PROCESS CHEMISTRY The silkworm moth lays about 500 eggs. The silkworms hatch and eat mulberry leaves to produce raw silk. They then begin to spin their cocoons. The cocoons are heated to kill the chrysalis within. The cocoons are then boiled to dissolve the sticky substance coating the thread. The silk thread is unwound with a loom. Silk is a protein. Proteins are made of a variety of amino acids. GLYCINE ALANINE SERINE Glycine, Alanine, and Serine are the most common amino acids that occur in silk. Silk is a polymer and its repeating units of amino acids vary somewhat, thus giving it a sparkly sheen. When silk's amino acids are bonded and arranged, it forms a "pleated sheet" structure. This gives silk its texture, strength, ease to dyeing, and resistance to stretch. Silk's molecular structure and price encouraged chemists to find methods of synthesizing the material. SYNTHETIC ARTIFICIAL same molecular structure
assembled in a lab or factory different molecular structure
mimics the original material NYLON SILK Nylon was invented in 1938 by the chemist Wallace Carothers.
He was commissioned by Du Pont and given an unlimited budget. & NYLON Through trial and error, Carothers produced nylon by connecting polymers. At its beginning, nylon was used for toothbrush bristles, stockings, tennis racket strings, fishing lines and nets, and wire coating. During WWII, nylon was used in the military for tire cords, mosquito netting, rope, and parachutes. Nylon is an effective substitute for silk because it is strong and inexpensive to produce. MODERN APPLICATIONS Silk is used in aviation and in oceanic exploration. It is also applied in the medical field: it is present in sutures and artificial tendons and ligaments. Nylon is used in packaging, string instruments, and to reinforce fibers of glass and carbon. It is also used in garments and straps. very nice. And when you want to go outside, you can chill out in your nylon tent and sleeping bag! Both silk and nylon were breakthrough materials that shaped the future. Their strength and light weight made them incomparable to any material used in the past. That's a suture (it's really just the thread used for stitches). By Saba Dowlatshahi, Lily Qian, and Emma Crutcher HOW CHEMISTRY HELPS US UNDERSTAND THIS Silk is made mostly of the fibroin protein. The fibroin is made up of amino acids (glycine and serine) that fold themselves mainly in beta pleats for the protein’s secondary structure, with the amino acids packed in closely with many hydrogen bonds. Nylon was the first synthetic material that was best able to replicate silk’s physical properties without being incredibly flammable.
Nylon is made of synthetic polymers that are joined by amide bonds. DuPont nylon is 6-6. The elements in these polymers are oxygen, nitrogen, hydrogen, and carbon.
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