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    Description

    Recently found experimental evidence has provided strong support for an alternative photoyellowing mechanism that suggests that pulp- photoyellowing occurs due to direct photooxidation of hydroquinones (present in mechanical pulps) top-quinones. Because hydroquinones were found to be present in pulps, it may be possible to quantify them. Quantification of mechanical-pulp hydroquinones is important because it would provide information on a pulp's potential for photoyellowing. One of the ways to accomplish this is to use the method that successfully detected hydroquinones, namely the method of "oxygensensitivity of laser- induced-fluorescence (LIF)". Preliminary findings of this work will be discussed in the presentation.

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Agarwal, Umesh P. 2000. Ranking mechanical pulps for their potential to photoyellow. Sixth European Workshop on Lignocellulosics and Pulp : Sept. 3-6, 2000, Bordeaux, France. Bordeaux, France : Bordeaux Universite, 2000: Pages 95-98

    Keywords

    Mechanical pulps, photoyellowing

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https://www.fs.usda.gov/treesearch/pubs/8882