Polymers Classification

Polymers Classification

1. What are Polymers?

   • Large Mollecules
   • Large Mollecular mass
   • Essential in...
     • Plastics
     • Elastomers
     • Fibres and Paints
     • Varnishes
   • Formed by polymerisation

2. Based on Source

   • Natural Polymers
     • In plants & animals
     • Ex. Protein, cellulose, starch
   • Semi-Synthetic Polymers
     • Cellulose derivates
     • Ex. Cellulose nitrate
   • Synthetic Polymers
     • Man-madae
     • Ex. Plastic

3. Based on Structure

   • Linear
     • Long & straight chains
     • Ex. Polyvinyl Chloride
   • Branched Chain
     • ex. Low density polythene
     • Linear with Branches
   • Cross Linked or Network
     • Contain strong Covalent Bonds
     • Ex. Bakelite, Melamine

4. Based on mode of Polymerisation

   • Addition polymers
     • Homopolymers: One type of monomer
     • Formed by adding monomers with double/triple bonds,
     • Copolymer: Different types of monomers
   • Condensation Polymers
     • Eliminates small mollecules
     • The reaction between two different monomeric units

5. Based on Molecular Forces

   • Elastomers
     • Elastic
     • Weak Intermolecular forces
     • ex. neoprene
   • Fibres
     • Thread forming solids
     • High tensile strenght
     • Strong intermolecular forces
     • ex. Nylon 6
   • Thermoplastic Polymers
     • Almost no branched chains
     • Heat=Softens Cool=Hardens
     • Intermolecular attraction
   • Thermosetting Polymers
     • Heavily branched molecules
     • Cannot be reused

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