Abstract
The process yielding the first species capable of being linked with a monomer molecule by a covalent bond while simultaneously endowing the added monomer unit with the activity associated with the initiator is the initiation of addition polymerization. The addition of an anion A - to a vinyl monomer CH2=CHX yielding a new A·CH2 CHX anion is an example of initiation of ionic polymerization. The addition of the next monomer molecule yields the same end-group but attached to a longer tail, i.e. A·CH2CHX·CH2 CHX. The sequence of the latter events constitutes the propagation of polymerization.
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