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Shezan Khan Grade: 11
        

Difference between chain growth and step growth polymerization

8 years ago

Answers : (1)

askIITIians Expert
21 Points
										

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.



 



 



8 years ago
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