Chain propagation
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(in a chain polymerization) Chemical reaction between a chain carrier and a monomer that results in the growth of a polymer chain and the regeneration of at least one chain carrier.
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In chemistry, chain propagation (sometimes just referred to as propagation) is a process in which a reactive intermediate is continuously regenerated during the course of a chemical chain reaction. For example, in the chlorination of methane, there is a two-step propagation cycle involving as chain carriers a chlorine atom and a methyl radical[1] which are regenerated alternately:
The two steps add to give the equation for the overall chain reaction:
Polymerization
In a chain-growth polymerization reaction, the reactive end-groups of a polymer chain react in each propagation step with a new monomer molecule transferring the reactive group to the last unit. Here the chain carrier is the polymer molecule with a reactive end-group, and at each step it is regenerated with the addition of one monomer unit M:
External links
- IUPAC Gold Book definition: chain-propagating reaction
References
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- ↑ Chain reaction IUPAC Gold Book
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