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End‐group evidence of zwitterionic species in the anionic polymerization of cyanoacrylates by Lewis bases
Author(s) -
Costa Gianna,
Loonan Conleth,
Pepper David
Publication year - 1997
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.1997.030180918
Subject(s) - phosphonium , cyanoacrylates , polymer chemistry , anionic addition polymerization , chemistry , polymerization , sulfur , end group , hydrolysis , depolymerization , telechelic polymer , tetrahydrofuran , lewis acids and bases , polymer , organic chemistry , cyanoacrylate , catalysis , adhesive , layer (electronics) , solvent
X‐ray fluorescence (XRF) spectra of poly(butyl cyanoacrylate) initiated, in tetrahydrofuran, by triphenylphospine and terminated by SO 3 , show the persistent presence of phosphorus and sulfur in the polymer, in near‐equivalent proportions, with the sulfur content partially removable by anion‐exchange. It is concluded that all chains have initial phosphonium groups, and, in abesence of any hydrolysis‐formed H 2 SO 4 , are macrozwitterions with terminal SO 3 − . Acid‐terminated chains should have proton‐capped ends and initial phosphonium + · HSO 4 − ion‐pairs.