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Kraft pulps at the κ number level of 15 obtained from  Acer saccharum  (sugar maple) and  Eucalyptus globulus  prepared with and without hot water extraction (HWE) were analyzed by inverse gas chromatography (IGC) and X-ray photoelectron spectroscopy (XPS). In the case of  A. saccharum  pulps, the dispersive component of the surface energy ( γ  s  d ) at 40°C determined by IGC was 39.8 mJ m -2  (control pulp without HWE) and 36.7 mJ m -2  (HWE pulp).  Eucalyptus globulus  pulps resulted in  γ  s  d  values of 30.8 mJ m -2  (control) and 34.9 mJ m -2  (HWE). The higher values of  γ  s  d  for sugar maple pulps were interpreted as the influence of lower amounts of extractives or lignin at their surface, as revealed by XPS. It is also discussed why the acid-base character of the sugar maple pulp surface was slightly reduced with previous HWE, whereas, for  E. globulus , it was greatly enhanced.

Inverse gas chromatography and XPS of extracted kraft pulps