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:
Itaconic acid, a carboxylated water-soluble vinyl monomer, is shown to greatly induce the thermal decomposition of potassium persulfate initiator. From decomposition rate studies carried out at 50, 60, and 70°C, the rate constants for this interaction are found to be increased eight to 15 times as much over the values of rate constants from uninduced decompositions. The induction is found to be particularly sensitive to the concentration of the first anion of itaconic acid and is thought to lead to wastage of initiator radicals. As the polymerization temperature is increased from 50 to 70°C, this interaction between itaconic acid and persulfate leads to worsening monomer conversion levels in acrylate latexes made with both compounds. Employing a water-soluble azo initiator in the presence of itaconic acid does not result in any induced decomposition of the former. Acrylate latexes prepared with these two compounds have monomer conversion levels which rise as the polymerization temperature is increased, as is expected in conventional emulsion polymerizations.
Additional Material:
11 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/app.1990.070391008
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