Grafting antioxidants; Part VI—grafting kinetics of 35S-Bridged aromatic diamines to rubbers
| Autor: | N. Negoita, Marilena Morjan, J.M. Herdan, Maria Giurginca |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
Degree of unsaturation
Materials science Polymers and Plastics Kinetics Condensed Matter Physics Grafting Rate-determining step chemistry.chemical_compound Reaction rate constant chemistry Natural rubber Mechanics of Materials Diamine visual_art Polymer chemistry Materials Chemistry Acetone visual_art.visual_art_medium |
| Zdroj: | Polymer Degradation and Stability. 43:203-208 |
| ISSN: | 0141-3910 |
| DOI: | 10.1016/0141-3910(94)90070-1 |
| Popis: | The grafting kinetics of bis-( N -isopropyl- N -phenyl- p -phenylenediamine) disulfide to polyisoprene and styrene-butadiene rubber was investigated using the 35 S labeled disulfide. The labeled compound was synthesized by reacting 35 S 2 Cl 2 with the diamine. The grafting was induced by thermal treatment. The ungrafted antioxidant was removed by acetone extraction and its concentration determined by measuring the radioactivity of the extracts. The concentration of the grafted antioxidant was determined by measuring the radioactivity of the extracted rubber films. The grafting is a first-order reaction, the rate determining step being the cleavage of the disulfide bond. The rate constants and activation energies depend on the degree of unsaturation of the rubber. |
| Databáze: | OpenAIRE |
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