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Homework Help: Stains and Fabrics

  1. Jan 30, 2009 #1
    1. The problem statement, all variables and given/known data

    So there are three fabrics with various stains, and you must figure out what type of bonding/interaction takes place between the stain and the fabric.

    Cotton: has lipstick, grass, charcoal, and..invisible potassium iodide stain
    Nylon: lipstick, charcoal, grass
    PVC (polyvinylchloride) : lipstick, charcoal, (not sure about grass)

    2. Relevant equations

    3. The attempt at a solution

    cotton: chlorophyll's positive centre forms dipole bond with negative atom in cellulose/cotton (or does the chlorophyll hydrogen bond with cellulose? not sure)
    eosin hydrogen bonds with cellulose
    charcoal = no idea.....carbon bonds with oxygen? dipole bonding?
    potassium iodide = no idea again...

    nylon: stains same interaction as on cotton

    charcoal = again, not sure. charcoal's giving me problems

    lipstick = eosin (negatively charged) bonds to the carbon in the polymer chain

    ((pvc i'm not sure about either, it could have something to do with the plasticizer dibutyl phthalate)).
  2. jcsd
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