what is the difference between condensation and addition polymerisation ???? and how iz nylon 6,6 formed ???

Addition and condensation polymers can be distinguished as follows.


Addition polymer


Condensation polymer


It is formed when the monomer units are repeatedly added to form long chains.


It is formed when two or more monomer units react together.


No elimination of any by-product takes place.


Elimination of simple compounds such as H2O, R–OH takes place.


For example:

Polythene is an addition polymer of ethylene.


For example:

Nylon (6, 6) is a condensation polymer obtained from hexamethylene diamine and adipic acid.


Example is:-Nylon 6,6 is formed by the polymerisation reaction of hexamethylene diamine and adipic acid.

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Addition Polymers
Condensation Polymers
Formed by addition reaction.

Formed by condensation process with elimination of small molecules like H2O.

Molecular mass is a whole number multiple of the monomer.

Molecular mass is not whole number multiple of the monomer units.

Generally involve one monomer unit.

Generally involve more than one monomer unit.

Monomers are unsaturated molecules.

Monomer units must have two active functional groups.

They are generally chain growth polymers.

They are generally step growth polymers.

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