ISSN:
0021-8995
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
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.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/app.1974.070181112
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