Characterization of eucalypt fibre surface using inverse gas chromatography and X-ray photoelectron spectroscopy

Wei Shen, W Yao, Mulan Li, Ian H Parker

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Inverse gas chromatography and X-ray photoelectron spectroscopy (XPS) were used to characterize the surface of bleached eucalypt kraft pulp fibres. The dispersive component of the surface energy and the work of adhesion due to specific (acid-base) interactions (WAAB) with molecular probes were measured for both the whole pulp and the primary fines. The effect of extraction, sizing and recycling of the fibres on these characteristics were also studied. The WAAB values reveal that the bleached eucalypt pulp fibres are bipolar with a strong acidic character. The primary fines, however, have a strong basic character. XPS results suggest that the primary fines have a higher surface concentration of lignin and extractives. Extraction of the fibre seems to remove unattached material from the fibre surface (this material is most likely to be composed of residual extractives and lignin that reprecipitated on the fibre surface during washing) and, as a result, extraction increases the fibre surface energy and polarity. The surface of recycled fibres is more hydrophobic than virgin fibres. This is likely to be due to deposits of hydrophobic ink components and/or deinking chemicals. Most of the contaminants do not bond strongly to the fibre surface. The implications of some of these fibre surface properties for sheet properties are discussed.
Original languageEnglish
Pages (from-to)147-151
Number of pages5
JournalAppita Journal
Issue number2
Publication statusPublished - 1998

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