A chain growth Polymerization requires an initiator. Can any material be used as

Question

A chain growth Polymerization requires an initiator. Can any material be used as an initiator? What kinds of molecules are usually used as an initiator and why are they preferred? What takes place during the propagation step? Describe a free radical? What is the differences between the starting material of a polymer ant the repeating unit? Why is the reaction that produces nylon called a condensation reaction? What is the small molecule eliminated when adipoyl chloride and hexamethylene diamine react?

Explanation / Answer

1) Initiator, a source of any chemical species that reacts with a monomer (single molecule) that can form chemical bonds) to form an intermediate compound. Initiators that produce free radicals are used for polymerization.

2) In Propagation step reactant radical is converted to product.

3) Free radical : Reactive atoms that contains odd number of electrons

5) In condensation reaction two different types of monomers are react and condense, so called condensation reaction.

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