sources of plastics
- Created by: aysen
- Created on: 08-01-14 22:04
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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
- casein
- 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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