8. Glossary
Primer
The initiation stage corresponds to the reaction of an A molecule, called an "initiator", which, under the effect of an energy input (light, heat, etc.) reacts (as A or rather in the form of fragments such as free radicals) with a monomer to initiate a polymerization chain reaction.
Molecular extinction coefficient
Absorption coefficient for a unit concentration of absorbing substance and a unit thickness defined by the rate of transmitted light (typically mole -1 .l.cm -1 ).
Planck constant
Constant that relates the energy of a photon to its frequency; it is 6.626 070 04 x 10 -34 m 2 ...
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