OCR AS Chemistry - Polymers

Polypropylene
1. Resistant to chemical attack
2. Uses
  1. Containers that are dishwasher safe
  2. Food packaging
  3. Fibre in carpets
  4. Ropes
Polythene
1. Most used plastic
2. Uses
  1. Shampoo bottles
  2. Plastic Bags
  3. Toys
Polyphenylethene
1. Cheap
2. Uses
  1. Insulation
  2. Model making in food industry
  3. Foam packaging
Polymer waste
1. Represent 10% of municipial waste
2. Non-biodegradable plastics is a major reason why plastics need to be recycled
  1. Recycling Polymers
    1. For every tonne of plastic recycled,about 1.8 tonnes of oil is saved
    2. Recyling started in early 1980s
    3. Recyling involves two stages
      1. Sorting
        The Polymer identification codes are used to seperate the plastics
        If PVC is not separated effectively from PET it undermines the recycling process. PVC is also known to release poisonous dioxins when heated
      2. Reclamation
        Chopped into small flakes before washing to remove impurities
        Waste is then made into new material by melting the pellets and remoudling
    4. Recycling PVC
      1. Problematic
        High chlorine content
      2. Incineration prevents PVC going into landfill sites
        May cause corrosion to the plant itself
        Acidic hydrogen chloride fumes are frequently detected
      3. First commercial PVC recycling plant
        PVC separated from other scrap by dissolving in solvents
        Solvent is recovered and used again
As a fuel source
1. Produced heat energy if burned
  1. Used for electricity
Biodegradable and compostable polymer
1. Bioplastics
  1. Compostable
  2. Biodegradable
  3. Derived from raw materials
    1. Starch
    2. Maize
    3. Cellulose
    4. Lactic Acid
  4. Manufactured by non hazardous processes
  5. Bioplastics degrade naturally in the enviroment
Polymer Identification codes

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	Creado por Chris Osmundse hace casi 11 años