Cross-linking Polyvinyl Alcohol

  1. Some friends and I are working on a movie, and we need a very stringy clear slime; like is produced with polyvinyl alcohol cross-linked with disodium tetraborate. Only we need it to be food-safe, so we can't simply use that. Is there another way to cross-link PVA into a stringy slime using edible chemicals?
     
  2. jcsd
  3. A few days ago I watched the movie Charlie and the Chocolate Factory, and therein was a slime that had pretty much the mechanical properties I'm looking for, and was edible. It wasn't transparent, but milky translucent. And green -- but that's just food coloring. What could it have been made of?

    Is cross-linking polyvinyl alcohol using an edible compound just not possible, at least yet?
     
  4. chemisttree

    chemisttree 3,723
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    It probably wasn't PVA-based. It could be any number of starches, gums or soluble polymers. Have you seen Guar gum by itself or Carageenan? How about plain Methocel or Ethocel?
     
  5. GCT

    GCT 1,769
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    OP ,

    I happen know that PVA with suitable macromers in water formulation would have the properties that you've mentioned ; also you can experiment with saturating water with the PVA and perhaps PVAc in water .
     
  6. Thanks, guys. :smile:

    Re: Methylcellulose

    I got some of it weeks ago, and tried it out. It's not the right texture. It's not stringy at all, but more like a yogurt.

    The other stuff mentioned looks like it will work.
     
  7. GCT

    GCT 1,769
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    Are you referring to Carboxymethyl cellulose ? From what I remember this is not exactly clear in water except at lower concentrations . It can get viscous as it is used as a lubricant .
     
  8. chemisttree

    chemisttree 3,723
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    Use the methocel to provide the base viscosity and blend with an extract of boiled okra for the stringiness.
     
  9. chemisttree

    chemisttree 3,723
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  10. Ah, mucilage - brilliant idea, there. :smile:
     
  11. I don't think so, but I wouldn't rule out that being what it is. The container just says methylcellulose -- bought it from a special FX supply company.

    It looks quite clear in water to me; though if I mix up a really thick batch (a ball of it will hold its shape against gravity, mostly), it's translucent.
     
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