Polymers

Polymers

1. What are Polymers

   • Very high molecules with a high molecular mass

2. Are backbone of 4 mayor industries

   • Plastics,elastomers,fibers, and paints

3. Can be categorized as

   • Natural polymers
     • Found in plants and animals
   • Semi-Synthetic polymers
     • Cellulose deriverates as cellulose acetate
   • Synthetic Polymers
     • Man made polymers for example plastic
   • Also by
     • Mode of polymerisation
       • Addition Polymers
         • Formed by the addition of monomer molecules possesing double or triple bonds
       • Condensation Polymers
         • Formed by repetead condensation reactions between bi/tri-Functional monomeric units

4. Types of polymer structure

   • Linear Polymers
     • Consist of long and straight chains
   • Branched chain polymers
     • Contain linear chains having some branches
   • Network Polymers
     • Strong covalent bonds between various linear polymer chains

5. Sub groups in bases of magnitude of intermolecular forces

   • Thermosetting Polymers
     • Are crossed linked molecules which on heating undergo extensive cross linking in moulds ang become infusible again
   • Elastomers
     • This are rubber, solids with elastic properties their polymer chains are held with the weakest intermolecular forces
   • Fibers
     • Are the thread forming solids, they posses high tensile strength an modulus
   • Thermoplastic polymers
     • linear/sligthly branched long chained molecules, the are capable of soften in heat and harden on cooling

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