Limit of Applicability of the Monomer-Enhanced Mechanism for Radical Generation in Persulfate Initiated Polymerization of Acrylamide
| Autor: | Rintoul, I., Wandrey, C. |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
MECHANISM
PERSULFATE Aqueous-Solution Redox Couple Ph Físico-Química Ciencia de los Polímeros Electroquímica Temperature Ciencias Químicas mechanism Water Potassium Persulfate Propagation Kinetics initiation Pulsed-Laser purl.org/becyt/ford/1 [https] INITIATION kinetics Copolymerization acrylamide Acrylic-Acid purl.org/becyt/ford/1.4 [https] ACRYLAMIDE persulfate KINETICS CIENCIAS NATURALES Y EXACTAS |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET |
| Popis: | The limit of applicability of the monomer-enhanced mechanism as dominant mechanism ruling the initiation process of the polymerization of acrylamide (AM) initiated with potassium persulfate (K2S2O8) has been determined. The kinetics and mechanisms for radical generation were studied in solution at very low monomer and initiator concentrations. The transition of the initiation mechanism from dominant monomer-enhanced dissociation to dominant thermal decomposition of persulfate was observed. Both mechanisms contribute equally to radical generation at [AM] / [K2S2O8] = 4.5. Thermal decomposition dominates at lower [AM] or higher [K2S2O8] and opposite variations promote the monomer-enhanced dissociation. This work also includes quantification of the rate coefficients, efficiencies and activation energies of the mentioned mechanisms, and the kinetics of AM polymerization when photochemically initiated with phenylbis(2,4,6-trimethylbenzoyl)-phosphine oxide. Fil: Rintoul, Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe. Instituto de Desarrollo Tecnológico Para la Industria Química (i); Argentina Fil: Wandrey, Christine. Ecole Polytechnique Federale de Lausanne; Suiza |
| Databáze: | OpenAIRE |
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