Abstract
2,6-Di-tert-butyl-4-methylpyridine (DBMP) effectively discriminates between the two major initiation mechanisms encountered in cationic polymerisation. Whenever a protonic acid is involved in the formation of chain carriers, directly or through cocatalysis, addition of equivalent amounts of DBMP inhibits the process. If however direct electrophilic addition of a Lewis acid to the monomer is the source of active species, the hindered base cannot intervene to alter its course. When both pathways are operative DBMP only quenches the former and provides a means of assessing the relative importance of each. Examples are given of the three situations. The simplicity of the method is emphasised.
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