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The possibility of living or long‐lived cationic polymerization in the butyl vinyl ether/iodine/liquid sulfur dioxide system
Author(s) -
Oliveria Marcia G.,
Moreira Ana C. F.,
Brandão Georgia T.,
Gomes Ailton S.,
Soares Bluma G.
Publication year - 1997
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1997.021980621
Subject(s) - cationic polymerization , chemistry , vinyl ether , living cationic polymerization , polymer chemistry , monomer , polymerization , iodine , aldehyde , hydrogen iodide , ether , polymer , suspension polymerization , iodide , end group , organic chemistry , catalysis
The polymerization of butyl vinyl ether (nBuVE) initiated by iodine in the presence of liquid sulfur dioxide has been investigated. The number‐average molecular weight increased with monomer concentration and after the addition of a fresh feed of the monomer at the end of the first polymerization step. This behavior has been observed in media of different polarity, that is, SO 2 /toluene = 80 : 10 or 50 : 40 v/v and SO 2 /CH 2 Cl 2 = 20 : 70 v/v 1 H NMR spectroscopy revealed the presence of aldehyde terminal group derived from acetal end group, indicating the presence of living or long‐lived propagating species. The average number of polymer chains carrying aldehyde end groups is higher than the initial iodine concentration, suggesting that an additional initiation process by hydrogen iodide is taking place.