Cse 3 Group 14

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polymerisation

• Presented by N . Sindhuja and N . Rishik Kumar

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Polymers combination of monomers is called
polymers.

• There are two types of polymers
• Addition polymerisation
• Condensation polymerisation

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Addition polymers

• Formation of long chain molecules from lots of
  small molecules joining together is addition
  polymerisation.
• Catalysts are used for polymerisation.

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Characteristics

• No bi products are formed.
• The functionality of monomers is double bond.
• The mechanism is rapid.
• It is highly exothermic reaction.

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Examples

• Process initiated by free radical.
• The free radical attacks double
• bond to from new free radical.
• 
  

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Condensation polymerisation

• Condensation polymers are polymers formed from
  condensation reactions between monomers.
• Many natural polymers are condensation polymers.
• examples silk , starch and DNA

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Characteristics

• The monomers must has contains two or more
  functional groups.
• The reactions catalysed by catalyst.
• The reactions are endothermic.
• There is elimination of biproducts.

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Examples polyesters
polyamides
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