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Difference between chain growth and step growth polymerization
Differences between chain growth and step growth polymerisation:
Chain growth polymerisation
Step growth polymerisation
*Concentration of monomers disappears early in the reaction.
* Concentration of monomers decreases steadily throughout the reaction
*Reaction is fast and polymer is formed at once.
*The polymer is formed in gradual steps.
*There is very little change in the molecular mass throughout the reaction.
*The molecular mass of polymer increases throughout the reaction.
*Increase in reaction time increases the yield but molecular weight is affected a little.
*Long reaction time is required to get high molecular mass polymer.
*Only one repeating unit is added at a time.
Any two species present can react.
*Reaction mixture contains only a monomer, polymer and growing chain.
*All molecular species are present at any stage.
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