Discussion
Step reaction polymerization proceeds by :
Answer: B
Step reaction polymerization proceeds by condensation polymerization.
In step-growth polymerization any two molecules carrying reactive functional groups (monomer, dimer or longer oligomer) can react with each other, and the chains build up stepwise. The usual examples, polyesters and polyamides such as nylon-6,6, link the monomers through a reaction that eliminates a small molecule such as water, which is why step-growth and condensation polymerization are commonly equated.
Addition polymerization, and its anionic and cationic forms, are chain-growth processes: an active centre (a radical, anion or cation) adds monomer units one after another to a single growing chain, and high polymer forms from the start of the reaction.
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