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Coagulation of a carboxylated latex with polyethylenimine
Author(s) -
Lauzon R. V.,
Schmidt D. D.
Publication year - 1974
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1974.070181112
Subject(s) - polyethylenimine , microelectrophoresis , polyelectrolyte , coagulation , surface charge , polymer chemistry , styrene , chemistry , protonation , materials science , chemical engineering , chromatography , electrophoresis , copolymer , organic chemistry , polymer , ion , biochemistry , psychology , transfection , psychiatry , engineering , gene
The coagulation of a carboxylated styrene/butadiene latex, using polyethylenimine (PEI), was investigated using a light transmission technique and microelectrophoresis. Two charge‐reversal regions were observed as the polyelectrolyte concentration was increased from 10 −4 to 1 wt‐%. During each of these regions, the latex was destabilized and then restabilized. The addition of HCI to the PEI solution can eliminate the second coagulation region completely while the first region is hardly affected. The second region was found to be dependent on the degree of protonation of the polyethylenimine and occurred in a pH range where the latex surface charge increases drastically as a function of increasing pH due to the ionization of surface carboxyl groups.