Write any two differences between step growth polymerisation and chain growth polymerisation.

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Solution

Step Growth Chain Growth
All molecules present (monomer, oligomer, polymer) can react with any other molecule. During propagation, only monomers react to the “active site” at the end of the growing chain
There is no termination step and the end groups of the oligomers and polymers are reactive throughout the polymerization process. There are two distinctive mechanisms during polymerization; these are initiation and propagation. In most cases there is also a termination step.

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Step Growth	Chain Growth
All molecules present (monomer, oligomer, polymer) can react with any other molecule.	During propagation, only monomers react to the “active site” at the end of the growing chain
There is no termination step and the end groups of the oligomers and polymers are reactive throughout the polymerization process.	There are two distinctive mechanisms during polymerization; these are initiation and propagation. In most cases there is also a termination step.