Describe the step growth polymerisation reaction with suitable example.
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Some examples are seen for the synthesis of thermoset through step-growth polymerization. For example, when monomers of amide-co-imide functional benzoxazine are heated at 200°C–215°C, then they are polymerized in a crosslinked thermoset through ring opening polymerization.
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Many naturally occurring and some synthetic polymers are produced by step-growth polymerization, e.g. polyesters, polyamides, polyurethanes, etc. Due to the nature of the polymerization mechanism, a high extent of reaction is required to achieve high molecular weight.
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