which type of molecule acts as a initiator in a cationic addition polymerization
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Cationic polymerizations are initiated by electrophilic agents such as the halohydric acids (HCl, HBr, etc.), H2SO4, HClO4, etc. Lewis acids, which are electron acceptors by definition, and compounds capable of generating carbonium ions can also initiate polymerization. Examples of Lewis acids are AlCl3, SnCl4, BF3, TiCl4, AgClO4, and I2. Lewis acid initiators required a co-initiator such as H2O or an organic halogen compound.
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