Chain propagation
IUPAC definition
(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.
Note 1: The recommended symbol for the rate constant for chain
propagation in a homopolymerization is kp.
and a monomer that results in the growth of a polymer chain and the
regeneration of at least one chain carrier.
Note 1: The recommended symbol for the rate constant for chain
propagation in a homopolymerization is kp.
Penczek S.; Moad, G. Pure Appl. Chem., 2008, 80(10), 2163-2193
Chain propagation (sometimes 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]
- Cl + CH4 → HCl + CH3
- CH3 + Cl2 → CH3Cl + Cl.
In a 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 that last unit.
External links
- IUPAC Gold Book definition: chain-propagating reaction
References
- ↑ chain reaction IUPAC Gold Book
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