This work investigates nano-fibrillated cellulose (NFC) as a component in mineral pigment paper coating. In this work, bleached Eucalyptus pulp was pretreated by TEMPO (2,2,6,6-tetramethyl-1-piperdinyloxy)-mediated oxidation. The oxidized pulp was then isolated to obtain NFC by sonication. Aqueous coating colors consisting of calcium carbonate, clay, carboxylated butadiene-styrene latex, additi...

Oxygen delignified kraft pulp from eucalyptus (E. urophylla × E. grandis) was catalytically pretreated in aerobic condition using ammonium persulfate in present of catalists like cupric acetate and/or cobalt acetate in acetic acid-water solution, i. e. S2O82--Cu2+, S2O8...

A method based on FT-Raman spectroscopy is proposed for determining in situ concentrations of ethylenic resi­ dues in softwood lignin. Raman contributions at 1133 and 1654 cm-1, representing coniferaldehyde and coni­ feryl alcohol structures, respectively, were used in quan­ tifying these units in spruce wood with subsequent conversion to concentrations in lignin. For coniferalde­ hyde units, t...

Abstract The characteristics of cellulose nanofibers (CNFs) depend on many factors such as the raw material, type and intensity pre-treatment, severity mechanical defibrillation process. relationship among is complex but crucial in determining final, fit-for-use CNF properties. This study aims to find between properties morphology, aspect ratio, nanofibrillation yield, transmittance cationic de...

In the area of photoyellowing of mechanical pulps, recently obtained experimental evidence has shown that hydroquinone/p-quinone redox couple is present in lignin-rich mechanical pulps. It was also noted that compared to a control pulp the concentration of pquinones was significantly higher in a photoyellowed pulp. Under ambient conditions, upon exposure to light, the existent pulp hydroquinone...

Wood-derived cellulosic fibers prepared in different ways were successfully employed to absorb simulated crude oil, demonstrating their possible use as absorbents in the case of oil spills. When dry fibers were used, the highest sorption capacity (six parts of oil per unit mass of fiber) was shown by bleached softwood kraft fibers, compared to hardwood bleached kraft and softwood chemithermomec...

Chelation of unbleached and oxygen bleached hardwood and softwood kraft pulps with EDTA was studied. The main focus was on the desorption of magnesium, manganese, and iron due to their impact in TCF-bleaching. Desorption of other metal ions present were also studied in order to get an over-all estimation of the metal ion concentrations and their desorption during chelation. By using the concept...