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| Untersuchte Arbeit: Seite: 49, Zeilen: 9-20 |
Quelle: Kęska 2006 Seite(n): 13-14, Zeilen: 13:18-20 - 14:1-8 |
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| Initially, through decomposition of an initiator two radicals are formed: persistent radical (R) and a propagating radical (transient radical) – (X). Whereas the transient radical may undergo irreversible radical-radical termination reaction (self-combinatiom) or reversible reaction with the persistent radicals, the persistent radical can only undergo a reversible recombination reaction with the transient radical. Thus, every irreversible self-termination reaction of transient radicals eliminates the transient radicals from the reaction medium and leads to buildup of excess of persistent radicals that increase with the reaction time. At elevated concentration of the persistent radicals they will undergo reversible deactivation to form the dormant species and this reaction will be favored over the irreversible self-combination reaction of the transient radicals. Thus, the irreversible reaction will be suppressed and the control over the polymerization will be achieved [Fis01], [Lut01].
[Fis01] Fischer, H. Chem. Rev. 2001, 101, 3581. [Lut01] Lutz, J. F.; Lacroix-Desmazes, P. P.; Boutevin, B. Macromol. Rapid. Commun. 2001, 22,189. |
[page 13]
Initially, through decomposition of an initiator two radicals are formed: persistent radical (R) and a propagating radical (transient radical) – (X). Whereas the transient radical may undergo irreversible radical-radical termination reaction (self-combinatiom) or reversible [page 14] reaction with the persistent radicals, the persistent radical can only undergo a reversible recombination reaction with the transient radical. Thus, every irreversible self-termination reaction of transient radicals eliminate the transient radicals from reaction medium and leads to buildup of excess of persistent radicals that increase with the reaction time. At elevated concentration of the persistent radicals they will undergo reversible deactivation to form the dormant species and this reaction will be favored over the irreversible self-combination reaction of the transient radicals. Thus, the irreversible reaction will be suppressed and the control over the polymerization will be achieved [39, 40]. [39] H. Fischer, Chem. Rev., 101, 3581-3610 (2001). [40] J.-F. Lutz, P. Lacroix-Desmazes, B. Boutevin, Macromol. Rapid. Commun., 22(3), 189-193 (2001). |
No source given. Nothing has been marked as a citation. |
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