sources of plastics

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  • sources of plastics
    • casein
      • by-products of milk are used to create the polymer. the material is still used in the manufacture of buttons.
    • general properties of polymers
      • good thermal & electrical insulators. good strength to weight ratio, e.g. they have good strength compared to their weight.good atmospheric resistance.
    • animal & vegetable
      • Are used in the manufacture of semi-synthetic polymers.i.e. cellulose is a natural material occurring in plants fibers. it is mixed with acetic acid to produce cellulose acetate from which products such as OHP slide and manufacture
    • synthetic plastics
  • plastics produced from these materials are gained through to process of 'thernal cracking'. therefore carbon- based and account for the majority of plastics used today.
    • synthetic plastics


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