Paper
Application of spin trapping technique to radical polymerization, 12 The polymerization of N‐vinylcarbazole with benzoyl peroxide
Published May 1, 1977 · Tsuneyuki Sato, M. Abe, T. Otsu
Macromolecular Chemistry and Physics
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Abstract
To clarify the initiation and propagation mechanisms of the polymerization of N-vinylcarbazole (1) initiated by benzoyl peroxide (2), the spin trapping technique using 2-methyl-2-nitrosopropane (5) was applied. From the ESR spectrum observed from this system, the 1-(N-carbazolyl)-2-benzoyloxyethyl radical (6a) was found to be trapped as its nitroxyl radical 6b, which was confirmed by a comparison with similar nitroxyl radicals (7b and 8b) derived from the systems, di-tert-butyl peroxalate/1/5 and 2/N-ethylcarbazole/5, respectively. Therefore, it was concluded that the 1/2 system produces easily a primary propagating radical of 1 viz. 6a. Further, the monomer 1 was found to show a remarkable accelerating effect on the radical decomposition of 2. From the copolymerization of 1 with styrene initiated by 2, it was concluded that 6a propagates by ordinary successive s-attack to the monomer 1.
The polymerization of N-vinylcarbazole with benzoyl peroxide produces a primary propagating radical, 6a, which propagates by ordinary successive s-attack to the monomer 1.
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