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Ir and Uv Spectroscopic Study of Borohydride Reduced Mechanical Pulp During Monochromatic and Wide Band Irradiation

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The fate of aromatic carbonyl groups during light-induced yellowing of peroxide-bleached mechanical pulps was investigated using infrared and uv-visible reflectance spectroscopies. If the interference of existing carbonyl groups is eliminated by borohydride reduction, both techniques indicate clearly that aromatic carbonyl groups are formed during irradiation. Methoxylated and unmethoxylated ortho-quinones were introduced into the pulp by treatment with sodium periodate or Fremy's radical. Comparison with pulps which were discoloured by monochromatic near-uv irradiation (λ = 320 nm) indicates that both types of quinones are formed during irradiation. The methoxylated quinones were bleached by 420 nm irradiation, but the unmethoxylated quinones seemed instead to sensitize destruction of aromatic groups.

Affiliations: 1: Paprican, 570 Boul. St. Jean, Pointe Claire, Québec, H9R 3J9; 2: Department of Chemistry, Pulp and Paper Research Centre, McGill University, 3420 University Street, Montrial, Québec, Canada H3A 2A7


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