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FT-IR Study of UV-Irradiated Stoneground Wood Pulp

Introduction The use of mechanical wood pulps in a number of applications is limited because of their rapid loss of brightness. Some understanding of the chemical changes responsible for brightness loss is required if this colour reversion is to be minimized.The chemical changes responsible for colour reversion are difficult to determine in situ, in part because of the relatively small chemical changes that are occurring in the heterogeneous and complex fibre surface matrix. A variety of infrared spectroscopic techniques (Hon and Chang 1984; StGermain and Gray 1987; Hon 1989; Michell et al 1989 a, b) have been applied to the problem. The difficulty of detecting the small JR spectral change during reversion is compounded by the variability in composition from point to point on the paper surface. In this study, the effects of non-uniformity of the sample were minimized by using the same spot on the sample for both the Irradiation and IR measurements.This facilitated a quantitative analysis of the chemical alteration of the pulps during Irradiation and storage. Furthermore, the sheet was irradiated with a narrow band of light centred at 320 nm, in order to Simplify the initial photochemical processes. The maximum in the action spectrum http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Holzforschung - International Journal of the Biology, Chemistry, Physics and Technology of Wood de Gruyter

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