Letter | Published:

Free Radical Formation in the Neutral Sulphitation of Wood at High Temperature

Naturevolume 207page631 (1965) | Download Citation

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Abstract

IN a previous report1, it was shown that, when wood and cellulose, pretreated with sodium hydroxide and afterwards freeze-dried, were rapidly heated in the cavity of an electron spin resonance (ESR) spectrometer to a temperature between 180° and 190° C, rapid formation of free radicals (radical centres) was recorded, and it was found that within a relatively short time free-radical decay took place, following approximately an exponential function. After cooling, a limited number of free radicals remained in the specimens; these free radicals were quite stable over a considerable period of time and were considered to be trapped by a ‘cage effect’ of the polymers.

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References

  1. 1

    Kleinert, T. N., and Morton, J. R., Nature, 196, 334 (1962).

  2. 2

    Wise, L. E., Murphy, N., and D'Addieco, A. A., Tappi, 29, 210 (1946).

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  1. 120 Embleton Crescent, Pointe Claire, Quebec

    • THEODORE N. KLEINERT

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https://doi.org/10.1038/207631a0

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