The surfaces of pressure groundwood (PGW), thermomechanical pulp (TMP), and chemithermomechanical pulp (CTMP) were studied by atomic force microscopy (AFM), x-ray photoelectron spectroscopy (XPS), contact angle measurement, and polyelectrolyte adsorption. The combination of these methods yielded a comprehensive picture of the chemistry, adhesive properties and morphology of the fiber surfaces and how they were affected by washing, peroxide bleaching, dithionite bleaching, and ozone treatment. Overall, the fiber surfaces were found to be very heterogeneous. Sulfite treatment in the production of CTMP pulp, peroxide bleaching under alkaline conditions, and ozone treatment modified especially the lignin and/or the pectins so that more acidic groups were introduced into the pulps. The adhesion between water and fibers increased when hydrophobic extractives (pitch) were removed by extraction with dichloromethane.
|Title of host publication||Characterization of Lignocellulosic Materials|
|Publication status||Published - 2008|
|MoE publication type||A3 Part of a book or another research book|