Polymers

Polymers

1. What are

   • molecules made of chains
     • Can be either
       • Natural
       • Synthetic or man made
     • Composed by large structural chains

2. Uses

   • In daily life
     • Platic buckets
     • Cups and saucers
     • synthetic clothing materials
     • automobile tyres
   • Industries
     • Plastics
     • Elastomers
     • Fibres
     • Varnishes

3. How are formed

   • by joining of repeating structural units
     • Simple and reactive molecules
       • Also known as Monomers
       • Classified in two parts
         • Addition Polymers
         • Condensation Polymers

4. Classifications of polymers

   • Natural polymers
     • Include silk, hair, proteins and DNA
   • Synthetic polymers
     • include polyethylene, polypropylene and polyester
   • Semi-synthetic polymers
     • Combination of both
   • Types based on the structure
     • Linear polymers
     • Branched chain polymers
     • Cross linked or Network

5. Applications

   • Aplicates depending on their mechanical properties
     • Like
       • Tensile strength
       • Elasticity
       • Toughness
     • These mechanical properties are governed by
       • Intermolecular forces
         • Example
           • Van der Waals forces
           • Hydrogen bonds
     • These forces also bind the polymer chains
       • And are classified in four groups
         • Elastomers
         • Fibres
         • Thermoplastic polymers
         • Thermosetting polymers

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