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Abstract
Abstract At pH 11 and 140°C, the rate of end-wise degradation (“peeling”) of hydrocellulose is approximately 27 percent of that in 1 N NaOH. As the pH is reduced further, the rate of peeling declines by a factor of 0.34 per pH-unit. This decline is less than expected on the basis of end-group ionization. Consequently end-wise degradation can be a significant reaction even at neutral pH. The peeling rate is strongly retarded at pH 11 and below by the presence of ammonia and, to a lesser degree, by borate. The retardation is believed to be caused by the formation of Shiff's bases in case of ammonia.
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