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Chemical Composition of Fibers. Chemical Composition of Fibers. Fibers are polymers: long chains made of simple molecules. Natural Fibers. Wool Polymer= Polypeptide chains (forming the protein keratin) Monomer= amino acids (one of which is cysteine . . .cysteine contains Sulfur ).

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chemical composition of fibers1

Chemical Composition of Fibers

Fibers are polymers:

long chains made of simple molecules

natural fibers
Natural Fibers
  • Wool
      • Polymer= Polypeptide chains (forming the protein keratin)
      • Monomer= amino acids (one of which is cysteine . . .cysteine contains Sulfur)

http://www.leydenglenlamb.com/photos.htm

natural fibers1
Natural Fibers
  • Wool
      • Polymer= Polypeptide chains (forming the protein keratin)
      • Monomer= amino acids (one of which is cysteine . . .cysteine contains Sulfur)
  • Silk
      • Polymer= protein
      • Monomer= amino acids (but less of a variety than wool)

http://entomology.unl.edu/images/silkworm/silkworm1.jpg

natural fibers2
Natural Fibers
  • Wool
      • Polymer= Polypeptide chains (forming the protein keratin)
      • Monomer= amino acids (one of which is cysteine . . .cysteine contains Sulfur)
  • Silk
      • Polymer= protein
      • Monomer= amino acids (but less of a variety than wool)
  • Cotton
      • Polymer= cellulose (plant)
      • Monomer= glucose

http://www.texaspolicecentral.com/Texas-Patriotism.php

natural fibers3
Natural Fibers
  • Wool
      • Polymer= Polypeptide chains (forming the protein keratin)
      • Monomer= amino acids (one of which is cysteine . . .cysteine contains Sulfur)
  • Silk
      • Polymer= protein
      • Monomer= amino acids (but less of a variety than wool)
  • Cotton
      • Polymer= cellulose (plant)
      • Monomer= glucose
  • Linen
      • Polymer= cellulose (flax plant)
          • Longer chains than cotton which makes it brittle
      • Monomer= glucose

http://www.flowers-cs.com/flax.html

man made fibers
Man-made Fibers
  • Rayon
    • Cellulose fiber, then chemically altered, burns like cotton
  • Acetate
    • Made from a reaction between cellulose and acetic acid
synthetic fibers generic classification of synthetic fibers
Synthetic Fibers: Generic classification of synthetic fibers
  • Polyamides

—linked by amino group

    • Example: Nylon
    • Stronger and more chemically inert than natural fibers

Image from: http://www.imageenvision.com/collection/fitness.html

synthetic fibers generic classification of synthetic fibers1
Synthetic Fibers: Generic classification of synthetic fibers
  • Polyamides—linked by amino group
    • Example: Nylon
    • Stronger and more chemically inert than natural fibers
  • Polyesters

—linked by ester group

    • Stronger linkage than polyamides
    • Linkage can be linear (flexible) or cross-linked (rigid)

Image from: http://www.imageenvision.com/collection/fitness.html

synthetic fibers generic classification of synthetic fibers2
Synthetic Fibers: Generic classification of synthetic fibers
  • Polyamides—linked by amino group
    • Example: Nylon
    • Stronger and more chemically inert than natural fibers
  • Polyesters—lined by ester group
    • Stronger linkage than polyamides
    • Linkage can be linear (flexible) or cross-linked (rigid )
  • Spandex—structurally similar to polyamide
    • Made of segments of polyurethane connected to long segments of polyesters
    • Resulting spandex can stretch up to 600 times and recover original strength

http://www.fingerpainrelief.com/rubber-band-therapy-for-finger-pain/

video clips on slide two click on the two pictures within the chain
Video clips on slide two—click on the two pictures within the chain
  • Clip 1
    • http://www.youtube.com/watch?v=cmlunCbBV_o&feature=related
    • If link is broken, go to YouTube and search “Oil Absorbing Polymer”
  • Clip 2
    • http://www.youtube.com/watch?v=YWoQ3D6RMXs&feature=related
    • If link is broken, go to YouTube and search “Spangler's Polymer Experiment on The Ellen Show”