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The Light-Induced Yellowing of Paper Studied by Second-Derivative DRIFT Spectroscopy

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The light-induced yellowing of the surface of paper made from a Eucalyptus regnans chemimechanical pulp has been studied by using second-derivative diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy in the region 1550 to 1800 cm−1. The observed reflectances were transformed to Kubelka-Munk units and the second derivatives obtained. Use of the second derivative technique has resulted in reduced bandwidths, enabling bands such as that at 1612 cm−1 arising from exocyclic C=C bonds in lignin to be resolved from the broad envelope of the strong C=C ring stretching band at 1591 cm−1. The improved resolution has enabled the effects of UV light on the population of potential chromophoric C=O and C=C groups in paper surfaces to be studied more precisely.

Keywords: DRIFT; FT-IR; Paper; Second-derivative; Spectroscopy; Wood pulp; Yellowing

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702894204227

Affiliations: Division of Forestry and Forest Products, CSIRO, Private Bag 10, Clayton, Australia 3168

Publication date: November 1, 1989

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