Is step growth polymerisation comes under condensation?
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The process of Step-growth polymerization is a little more complicated than chain-growth polymerization.Now let us look at an example for Step-Growth Polymerization for better understanding. Let us consider the process of making Polyester called polyethylene terephthalate.
The two monomers which are terephthaloyl chloride and ethylene glycol react to form a dimer-ester dimer. A dimer is two structurally same or similar monomers attached to each other by bonds that can be either strong, weak, covalent or intermolecular.
In this stage of a chain growth system, a third monomer would add to the dimer to form a trimer, then a fourth to form a tetramer, and continue so forth. But this is not the case when it comes to Step-growth polymerization.
The dimer in this instance during step-growth polymer can undergo different changes. It can react with one of the monomers to form a trimer.
That was one possibility. The dimer can also attach to another dimer to form a tetramer:
The dimer may also bond with a trimer to form a pentamer.
Making things more complicated, these newly formed tetramers and pentamers can undergo reaction to form even bigger oligomers. This process may continue, resulting in growth of these oligomers and eventually the oligomers are big enough to be classified as polymers
The process of Step-growth polymerization is a little more complicated than chain-growth polymerization.Now let us look at an example for Step-Growth Polymerization for better understanding. Let us consider the process of making Polyester called polyethylene terephthalate.
The two monomers which are terephthaloyl chloride and ethylene glycol react to form a dimer-ester dimer. A dimer is two structurally same or similar monomers attached to each other by bonds that can be either strong, weak, covalent or intermolecular.
In this stage of a chain growth system, a third monomer would add to the dimer to form a trimer, then a fourth to form a tetramer, and continue so forth. But this is not the case when it comes to Step-growth polymerization.
The dimer in this instance during step-growth polymer can undergo different changes. It can react with one of the monomers to form a trimer.
That was one possibility. The dimer can also attach to another dimer to form a tetramer:
The dimer may also bond with a trimer to form a pentamer.
Making things more complicated, these newly formed tetramers and pentamers can undergo reaction to form even bigger oligomers. This process may continue, resulting in growth of these oligomers and eventually the oligomers are big enough to be classified as polymers
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