Cationic Polymerization
The initiator is an electrophile that adds to the alkene, causing it to b
cation
The initiator most often used in cationic polymerization is a Lewis a
as BF3 or AlCl3
The advantage of such an initiator is that it does not have an accom
nucleophile that could act as a chain terminator
The cation formed in the initiation step reacts with a second m
forming a new cation that reacts in turn with third monomer
As each subsequent monomer adds to the chain, the positive
propagating site always ends up on the last unit added
,
, Cationic polymerization can be terminated by loss of proton or by additi
nucleophile that reacts with the propagating site
The chain can also be terminated by a chain-transfer reaction with solve
The initiator is an electrophile that adds to the alkene, causing it to b
cation
The initiator most often used in cationic polymerization is a Lewis a
as BF3 or AlCl3
The advantage of such an initiator is that it does not have an accom
nucleophile that could act as a chain terminator
The cation formed in the initiation step reacts with a second m
forming a new cation that reacts in turn with third monomer
As each subsequent monomer adds to the chain, the positive
propagating site always ends up on the last unit added
,
, Cationic polymerization can be terminated by loss of proton or by additi
nucleophile that reacts with the propagating site
The chain can also be terminated by a chain-transfer reaction with solve
