Water sorption and surface composition of untreated or oxygen plasma-treated chemical pulps

Carlsson, Gilbert; Ström, Gōran; Annergren, Göran

doi:10.3183/npprj-1995-10-01-p017-023

Cited by 25 publications

(13 citation statements)

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“…The values are rather well in accordance with literature; Schaub et al (1993) reported contact angles of 25°f or LB cellulose and Carlsson and Stro¨m (1995) reported contact angles of 30°for unextracted bleached kraft pulp. The standard deviations for all surfaces, polystyrene, TMSC and cellulose, are almost at the same level (±1-3°).…”

Section: Wettingsupporting

confidence: 89%

Preparation of Langmuir/Blodgett-cellulose Surfaces by Using Horizontal Dipping Procedure. Application for Polyelectrolyte Adsorption Studies Performed with QCM-D

et al. 2006

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A method of preparing model cellulose surfaces by the Langmuir-Blodgett (LB) technique with horizontal dipping procedure has been developed. The primary aim for the use of these surfaces was adsorption studies performed with the quartz crystal microbalance with dissipation (QCM-D) instrument. Hydrophobised cellulose (trimethylsilyl cellulose, TMSC) was deposited on the hydrophobic, polystyrene-coated QCM-D crystal. After 15 dipping cycles, the TMSC film fully covers the crystal surface. TMSC can easily be hydrolysed back to cellulose with acid hydrolysis. With this method a smooth, rigid, thin and reproducible cellulose film was obtained. Its morphology, coverage, chemical composition and wetting was further characterised using atomic force microscopy (AFM), X-Ray photoelectron spectroscopy (XPS), and contact angle measurements. The swelling behaviour and the stability of the cellulose film in aqueous solutions at different ionic strengths were studied using the QCM-D instrument. The swelling/deswelling properties of the cellulose film were those expected of polyelectrolytes with low charge density; some swelling occurred in pure water and the swelling decreased when the ionic strength was increased. No significant layer softening was detected during the swelling. The effect of electrolyte concentration and polymer charge density on the adsorption of cationic polyelectrolytes on the cellulose surface was also investigated. At low electrolyte concentration less of the highly charged PDADMAC was adsorbed as compared to low charged C-PAM. The adsorbed amount of PDADMAC increased with increasing ionic strength and a more compact layer was formed while the effect of electrolyte concentration on the adsorption of C-PAM was not as pronounced.

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Section: Wettingsupporting

confidence: 89%

Preparation of Langmuir/Blodgett-cellulose Surfaces by Using Horizontal Dipping Procedure. Application for Polyelectrolyte Adsorption Studies Performed with QCM-D

et al. 2006

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“…Past studies involving lignocellulosics have shown that dielectric-barrier discharge treatment of cellophane, sized papers, and wood improves wettability and that the roughness of cellophane increases with increased treatment (Brown and Swanson 1971;Sabharwal et al 1993;Rhen and Vio¨l 2003). Studies involving oxygen plasma treated pulps indicate increased oxidation and wettability of pulps containing significant amounts of lignin and extractives (Carlsson et al 1995). In addition, the dielectric-barrier discharge treatment of wood and paper improves the adhesion of paints and glues (Back and Danielsson 1987).…”

Section: Introductionmentioning

confidence: 96%

Analysis of the topochemical effects of dielectric-barrier discharge on cellulosic fibers

2005

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This study investigates the fundamental topochemical effects of dielectric-barrier discharge treatment on bleached chemical pulp and unbleached mechanical pulp fiber surfaces. Fibers were treated with various levels of dielectric-barrier discharge treatment ranging from 0 to 9.27 kW/m 2 /min. Changes to the fiber surface topochemistry were investigated by atomic force microscopy (AFM). The AFM studies were complemented by inverse gas chromatography (IGC), contact angle evaluation, poly-electrolyte titration, viscosity testing and determination of water retention value (WRV). The static coefficient of friction and zero-span tensile index of sheets were also evaluated. Low dielectric-barrier discharge treatment levels resulted in increased surface energy and roughness. Fibers treated at high applied power levels showed surface energies and roughness levels near that of reference samples as well as evidence of degradation and decreased fiber swelling.Abbreviations: AFM -atomic force microscopy; BKP -bleached kraft pulp; IGC -inverse gas chromatography; TMP -thermomechanical pulp; WRV -water retention value.

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“…Therefore, modifications to HYP are needed to improve the quality of the paper and hence broaden its application (Lachenal et al 1995;Henriksson and Gatenhalm 2002). The common modification methods for fiber include mechanical modification, chemical modification (Gruber et al 2002), and physical modification (Goring 1967;Carlsson and Ström 1995). With the development of biotechnology, enzymes are of great interest in studies for the modification of pulp (Sigoillot et al 1997;Richardson et al 1998;Henriksson and Gatenhalm 2002).…”

Section: Introductionmentioning

confidence: 99%

Structural Analysis of Fast-Growing Aspen Alkaline Peroxide Mechanical Pulp Lignin: A Post-Enzymatic Treatment

et al. 2016

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An enzymatic mild acidic hydrolysis was used to separate and purify residual lignin from alkaline peroxide mechanical pulp (APMP). Using the optimum conditions for the laccase treatment (pH 4.5, temperature 50 °C, lignin consistency of 1%, a reaction time of 60 min, and a laccase dosage of 8 μ/g), oven-dried lignin was treated with laccase and in a laccase mediator system (LMS) to explore the mechanism for laccase and the LMS modification of APMP. The changes of functional groups in lignin were analyzed using nuclear magnetic resonance ( C-NMR spectra revealed that the lignin structure changed significantly with the laccase and the LMS treatments. Meanwhile, GPC demonstrated that laccase without a mediator could lead to the polymerization of lignin, while the LMS could degrade the lignin. Hence, it was concluded that laccase is an attractive enzyme for lignin modification.

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Water sorption and surface composition of untreated or oxygen plasma-treated chemical pulps

Cited by 25 publications

References 0 publications

Preparation of Langmuir/Blodgett-cellulose Surfaces by Using Horizontal Dipping Procedure. Application for Polyelectrolyte Adsorption Studies Performed with QCM-D

Preparation of Langmuir/Blodgett-cellulose Surfaces by Using Horizontal Dipping Procedure. Application for Polyelectrolyte Adsorption Studies Performed with QCM-D

Analysis of the topochemical effects of dielectric-barrier discharge on cellulosic fibers

Structural Analysis of Fast-Growing Aspen Alkaline Peroxide Mechanical Pulp Lignin: A Post-Enzymatic Treatment

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