4.1.3 polymers mindmap

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  • Created by: avocado05
  • Created on: 25-02-22 14:27
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  • polymers
    • disposing of polymers
      • reducing  environmental damage
        • develop biodegradable polymers as alternatives
        • develop ways of cracking
        • use for feedstock recycling
      • processing usefully
        • separation into types and recycling
        • combustion  for energy
        • used for cracking
      • problems disposing polymers
        • produces harmful/toxic fumes when burnt
          • HCl /toxic dioxins evolved when PVC burnt
        • non-biodegradable
    • recycling polymers
      • advantages
        • confines finite resources
        • decreases waste in landfill
      • disadvantages
        • polymers must be sorted by type
          • cannot be used for mixed polymers
      • process
        • polymer chopped to flakes, washed and melted
        • cut into pellets and used to make new products
    • PVC recycling
      • advantages
        • involved grinding PVC and reusing
        • solvents used to dissolve polymer and PVC recovered by precipitation
      • disadvantages
        • dumping in landfill unsustainable
        • when burnt releases HCL and toxic dioxins
    • feedstock recycling
      • chemical/thermal process that reclaims monomers from waste polymers
        • handles unsorted polymers
      • products resemble those from crude oil in refineries
        • can be used as raw materials
    • photodegradable polymers
      • contain bonds weakened by absorption of light so degrade
    • biodegradable polymers
      • microorganisms break them down into H2O, CO2 and biological compounds
        • degrade and leave no toxic residue
        • usually made from starch/cellulose that alter structure so can be beat down
  • microorganisms break them down into H2O, CO2 and biological compounds
    • degrade and leave no toxic residue
    • usually made from starch/cellulose that alter structure so can be beat down

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