ISSN:
0022-3832
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The polyaminocarboxylic acids, ethylenediaminetetraacetic acid (EDTA), methylethylenediaminetetraacetic acid (MeEDTA), diethylenetriaminepentaacetic acid (DTPA), and cyclohexanediaminetetraacetic acid (CDTA) have been used to chelate the iron in the system ferrous iron-hydrogen peroxide when it is used as an initiator for the emulsion polymerization of styrene. In each case, the zero-order rate of polymerization decreased from pH 0.5, when it was identical to that in the absence of any chelating agent, to a minimum value in the pH region 3.5-6.5, after which it rose again. In acid solution the results are not the same as those anticipated from the redox potentials of the ferrous-ferric-chelating agent system at various pH values, and this has been found to be due to the dissociation of the iron chelate at a low pH.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1960.1204213909
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