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Synthetic dyesNatural dyes Text: Chapter 12 pp 400-405.

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Presentation on theme: "Synthetic dyesNatural dyes Text: Chapter 12 pp 400-405."— Presentation transcript:

1 Synthetic dyesNatural dyes Text: Chapter 12 pp

2 Natural fibers: cellulose (polysaccharides) Text: Chapter 4 pp Cellulose Fibers Cotton Linen Cellulose Derivatives (viscose) Rayon (viscose) Acetate

3 Natural fibers: proteins Protein Fibers: silk and wool Text: Chapter 4 pp

4 Synthetic fibers: Text: Chapter 12 pp Cellulose Derivatives (viscose) Rayon (viscose) Acetate The chemical process Making Viscose Rayon 

5 Synthetic fibers: Viscose Acetate Text: Chapter 12 pp The chemical process Making Viscose Acetate 

6 How Dyes Attach to Fibers Text: Chapter 12 pp Acid dyes use electrostatic interactions Mordants bind to dyes and to fibers

7 Text: Chapter 12 pp How Dyes Attach to Fibers How a reactive dye binds to fibers

8 Perkins Purple Mauveine was discovered serendipitously in 1856 by 18-year old William Henry Perkin, who was trying to synthesize the anti-malaria drug quinine as a challenge from his professor, August Wilhelm von Hofmann. In one of his attempts, Perkin oxidized aniline using potassium dichromate. Under these conditions, the aniline reacted with toluidine impurities in it to produce a black solid, a fairly common result in "failed" organic syntheses. While trying to clean out his flask, Perkin discovered that some component of the black solid dissolved in alcohol to give a purple- colored solution, which proved to be an effective dye for silk and other textiles. Wikipedia’s story And this was the beginning of the chemical industry ….

9 Perkin Transactions of the Royal Society of Chemistry UK Major journal reporting Organic Chemistry

10 Related hydrocarbon rings from petroleum Related rings in dyes (in pigments)

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