Step growth or condensation polymerisation : In this type of polymerisation monomers generally contain two functional sets, i.e., difunctional monomers. In that procedure no initiator is needed and each step is the same type of chemical reaction. Since in that polymerisation reaction the polymer is formed in a stepwise manner. It is defined as step growth polymer and the process is defined as step growth polymerisation. The procedure for two monomer A and B can be expressed as.
Alternatively, step growth can proceed as
Some general examples of step growth polymers are
Polymers
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Monomers
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Nylon-66
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adipic acid and Hexamethylenediamine
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Bakelite
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Phenol and formaldehyde
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Dacron (polyester)
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Terephthalic acid and ethylene glycol
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