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POLYMERS (Polyorefins (Poly vinyl chloride (PVC) (-Cl (Dibenzoyl…

- - - - Dibenzoyl peroxide
  - - - Polymerisation
  - - - (C6H5COO)2, Benzoyl peroxide
  - - - Catalyst, High pressure
  - - - HDP: 320-570K, 1000-2000atm,Traces of oxygen and hydrogen peroxide
      - LDP: 333-343K, 6-7atm, Zieglar natta catalyst
  - - - Polymerisation, Peroxide
- - - - Benzene
        
        Cyclohexanone
        
        (C6H5=NOH)
        
        CAPROLACTUM
    - - Caprolactum
        
        Linear
        
        Nylon 6
- - - - Strong intermolecular forces like hydrogen bonding
      - High tensile strength and high modulus
      - Forces lead to close packing of chains
        
        Impart crystalline nature
      - Eg. Polyamides (nylon 6,6) and Polysters (terylene)
    - - Weak Van der waals forces
      - Linear/ Slightly branched
      - Capable of repeatedly softening on heating and hardening on cooling
      - Intermolecular Forces of attraction intermediate between elastomers and fibres
      - Eg. Polythene, polystyrene, and polyvinyls
    - - Weak intermolecular forces
      - Rubber-like solids with elastic properties
      - Eg. natural polymer, Buna-N, Buna-S, neoprene
    - - Cross linked/ Heavily branched molecules
      - On heating, undergoes extensive cross-linking in moulds
      - Again becomes infusible
      - Eg. Bakelite, urea formaldehyde resins,etc.
- - - - Chain propagation step
      - Chain termination step
      - Chain initiation step
      - Monomers
        
        Mono substituted alkenes
        
        Catalysts
        
        Benzoyl peroxide
        
        Hydrogen peroxide
        
        T-Butyl peroxide