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  • 1. Feiler, A. A.
    et al.
    Jenkins, P.
    Rutland, Mark W
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface Chemistry.
    Effect of relative humidity on adhesion and frictional properties of micro- and nano-scopic contacts2005In: Journal of Adhesion Science and Technology, ISSN 0169-4243, E-ISSN 1568-5616, Vol. 19, no 05-mar, p. 165-179Article in journal (Refereed)
    Abstract [en]

    The effect of relative humidity (RH) oil the interactions of AFM tips and colloidal probes with hydrophilic silica substrates is investigated. Both friction and adhesion are studied. For the case of a colloidal probe the interaction is characteristic of a multiasperity contact, the adhesion increased with increasing RH and above a certain threshold relative humidity a large increase in adhesion was measured. This behaviour is explained in terms of a recent model where the Kelvin radius of the condensate becomes larger than some characteristic roughness on the surface. The interaction between the tip and the substrate also exhibited an increase in adhesion above a threshold RH although the increase was much less marked than with the colloid probe. The friction decreased with increasing humidity for both tip and colloid probe although the friction force was much less sensitive than adhesion to changes in RH. Stick-slip behaviour was observed between tip and substrate for all humidities at high loads, but only at the lowest RH (about 5%) it was observed at all loads. At higher humidity the behaviour became increasingly continuum on the experimental timescale, presumably due to viscous contributions from the water. Stick-slip was not observed for the colloidal probe friction measurements.

  • 2. Forsstrom, J.
    et al.
    Eriksson, M.
    Wågberg, Lars
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
    A new technique for evaluating ink-cellulose interactions: initial studies of the influence of surface energy and surface roughness2005In: Journal of Adhesion Science and Technology, ISSN 0169-4243, E-ISSN 1568-5616, Vol. 19, no 9, p. 783-798Article in journal (Refereed)
    Abstract [en]

    Ink-cellulose interactions were evaluated using a new technique in which the adhesion properties between ink and cellulose were directly measured using a Micro-Adhesion Measurement Apparatus (MAMA). The adhesion properties determined with MAMA were used to estimate the total energy release upon separating ink from cellulose in water. The total energy release was calculated from interfacial energies determined via contact angle measurements and the Lifshitz-van der Waals/acid-base approach. Both methods indicated spontaneous ink release from model cellulose surfaces, although the absolute values differed because of differences in measuring techniques and different ways of evaluation. MAMA measured the dry adhesion between ink and cellulose, whereas the interfacial energies were determined for wet surfaces. The total energy release was linked to ink detachment from model cellulose surfaces, determined using the impinging jet cell. The influences of surface energy and surface roughness were also investigated. Increasing the surface roughness or decreasing the surface energy decreased the ink detachment due to differences in the molecular contact area and differences in the adhesiom properties.

  • 3.
    Gardner, D. J.
    et al.
    University of Maine.
    Wålinder, Magnus E. P.
    Trätek Swedish Institute for Wood Technology Research.
    Editorial note2006In: Journal of Adhesion Science and Technology, ISSN 0169-4243, E-ISSN 1568-5616, Vol. 20, no 8, p. 723-723Article in journal (Other academic)
  • 4. Gardner, Douglas J.
    et al.
    Wålinder, Magnus E. P.
    Trätek Swedish Institute for Wood Technology Research.
    Special Issue on Wood Adhesion and Adhesives2006In: Journal of Adhesion Science and Technology, ISSN 0169-4243, E-ISSN 1568-5616, Vol. 20, no 8, p. 725-727Article in journal (Other academic)
  • 5.
    Kamal Alm, Hajer
    et al.
    Innventia AB, Sweden.
    Ström, Göran
    Innventia AB, Sweden.
    Schoelkopf, Joachim
    Omya AG.
    Gane, Patrick
    Omya AG.
    Ink-lift-off during offset printing: a novel mechanism behind ink-paper coating adhesion failure2014In: Journal of Adhesion Science and Technology, ISSN 0169-4243, E-ISSN 1568-5616, Vol. 29, no 5, p. 370-391Article in journal (Refereed)
  • 6.
    Kamal, Hajer
    et al.
    Innventia AB, Sweden.
    Ström, Göran
    Innventia AB, Sweden.
    Schoelkopf, Joachim
    Omya AG.
    Gane, Patrick
    Omya.
    Characterization of ink-paper coating adhesion failure: Effect of Pre-dampening of Carbonate Containing Coatings2010In: Journal of Adhesion Science and Technology, ISSN 0169-4243, E-ISSN 1568-5616, Vol. 24, no 3, p. 449-469Article in journal (Refereed)
    Abstract [en]

    To attain an improved knowledge about ink-paper coating adhesion during offset printing, we have developed a laboratory procedure to measure adhesion failure between ink and coated paper during ink setting. This paper describes the technique and a special case where two ground calcium carbonate (GCC)-based coatings have been printed, one normal coating containing the delivered amount of dispersing agent already present in a typical GCC slurry and another coating made from the same GCC slurry but with excess additional free dispersant in the form of sodium polyacrylate. The areas where the ink-paper coating adhesion had failed at the pull-off points after tack testing were characterized by determining white spots in the retained print using image analysis. The white spots represent areas where ink has detached from the coating after contact with a rubber coated cylinder. This area is referred to as ink-paper coating adhesion failure area (IPCAFA). A minimum in IPCAFA at the point of maximum in tack force was found for both coatings where the print was applied onto dry coating. When the coatings, however, were pre-damped, IPCAFA increased on the normal coating over a short time period, independent of the dampening level. For the coating with excess dispersant, on the other hand, the higher dampening level strongly increased the IPCAFA. The strong impact of excess dispersing agent in this work may be explained by a number of related effects, including increased polarity of the coating surfiated moisture layer and an effective reduction of fine pores due to water-swelling polyacrylate that blocks these pores.

  • 7. Osterberg, M.
    et al.
    Claesson, Per M.
    KTH, Superseded Departments, Chemistry.
    Interactions between cellulose surfaces: effect of solution pH2000In: Journal of Adhesion Science and Technology, ISSN 0169-4243, E-ISSN 1568-5616, Vol. 14, no 5, p. 603-618Article in journal (Refereed)
    Abstract [en]

    The forces acting between cellulose surfaces have been studied using the interferometric surface force apparatus. The cellulose surfaces were prepared by Langmuir-Blodgett deposition of trimethylsilyl cellulose (TMSC) onto hydrophobized mica. Prior to measurements, the surfaces were desilylated to obtain pure cellulose. The degree of silylation and the molecular weight of the TMSC both affect the structure of the deposited layer. This was observed from the surface pressure-area isotherm, force versus distance curves, and atomic force microscopy images. The forces between the cellulose surfaces were found to depend on the pH of the solution. In dilute electrolyte solutions, the cellulose film was uncharged and rather compact when the pH of the solution was 6.0. However, when the pH was increased to 7.3, the cellulose film swelled considerably and a long-range steric force was measured. The swelling of the film is interpreted as being due to the dissociation of a few carboxylic acid groups present along the cellulose chain. The forces measured were, however, dominated by steric interactions. The repulsion does not increase substantially when the pH is increased from 7.3 to 9.5. Our results suggest that the pK(a) of the acid groups present within the cellulose film is larger than it would be in the bulk aqueous solution.

  • 8. Plunkett, M. A.
    et al.
    Rodner, S.
    Bergström, L.
    Rutland, Mark W
    KTH, Superseded Departments, Chemistry.
    Surface forces and characterization of glass surfaces bearing grafted polymers: solvent dependence2002In: Journal of Adhesion Science and Technology, ISSN 0169-4243, E-ISSN 1568-5616, Vol. 16, no 7, p. 965-981Article in journal (Refereed)
    Abstract [en]

    The interactions between two glass surfaces bearing grafted polymer brushes of poly(12-hydroxystearic acid) (PHS) have been controlled by altering the solvent quality. The graft density was obtained through XPS and the solvent used was a mixture of ethanol and heptane, which was varied from good to poor solvency conditions by either a change of the relative concentrations of the two solvents, or by altering the temperature. The system is shown to be remarkably sensitive to the solvency conditions around the theta position. It was also shown that hydrodynamic forces could be accurately and routinely accounted for in systems where the forces were monotonically repulsive.

  • 9. Plunkett, M. A.
    et al.
    Rutland, Mark W
    KTH, Superseded Departments, Chemistry.
    Dynamic adhesion of grafted polymer surfaces as studied by surface force measurements2002In: Journal of Adhesion Science and Technology, ISSN 0169-4243, E-ISSN 1568-5616, Vol. 16, no 7, p. 983-996Article in journal (Refereed)
    Abstract [en]

    Surface force experiments have been carried out to investigate the dynamics of adhesion for grafted polymer-coated glass spheres in a solvent. The quality of solvent has been varied both by changing the relative concentrations in a mixed solvent system and by variations in temperature in order to investigate the effect on the measured adhesion. Under very poor solvent conditions (far from theta conditions) there is a contact time dependence of the magnitude of the adhesion, that can be explained in terms of polymer interpenetration. This interpenetration is consistent with the diffusion following primitive path fluctuation dynamics. An increase in the maximum applied load leads to a decrease in adhesion which is attributed to a slower diffusion rate due to squeezing out of the solvent from the contact zone. Under slightly poor solvent conditions (near-theta conditions), any polymer interdiffusion is found to be rapid on the experimental time frame. In this case the adhesion is strongly dependent on the separation rate, which is interpreted in terms of viscoclastic losses at the crack tip.

  • 10.
    Rutland, Mark W.
    et al.
    KTH, Superseded Departments, Chemistry.
    Tyrrell, J. W. G.
    Attard, P.
    Analysis of atomic force microscopy data for deformable materials2004In: Journal of Adhesion Science and Technology, ISSN 0169-4243, E-ISSN 1568-5616, Vol. 18, no 10, p. 1199-1215Article in journal (Refereed)
    Abstract [en]

    A protocol for measuring the interaction, deformation and adhesion of soft polymeric substrates with the atomic force microscope (AFM) is described. The technique obtains the photodiode response of the AFM (constant compliance factor) by independent calibration against the rigid substrate adjacent to the deformable particle or patchy film. The zero of separation is taken as the end-point of the jump into contact. A method is given for correcting the velocity dependence of the piezodrive expansion factor, the neglect of which will cause artefacts in dynamic viscoelastic measurements. It is emphasised that conventional force curve analysis, which uses the apparently linear large force region for calibration, will generate erroneous results for deformable substrates. Results are obtained for cellulose particles and for polystyrene films, and their Young's moduli are found to be 22 MPa and 100 MPa, respectively. The latter is about a factor of 30 less than for bulk polystyrene, which indicates that the polystyrene surface is in a less glassy state than the bulk.

  • 11.
    Tze, W. T. Y.
    et al.
    University of Maine.
    Wålinder, M. E. P.
    Trätek - Swedish Institute for Wood Technology Research, Stockholm, Sweden.
    Gardner, D. J.
    University of Maine.
    Inverse gas chromatography for studying interaction of materials used for cellulose fiber/polymer composites2006In: Journal of Adhesion Science and Technology, ISSN 0169-4243, E-ISSN 1568-5616, Vol. 20, no 8, p. 743-759Article in journal (Refereed)
    Abstract [en]

    The objective of this research was to use inverse gas chromatography (IGC) to infer fiber-matrix interactions for predicting practical adhesion between cellulose fibers and polystyrene matrix polymer. IGC experiments were performed on polystyrene, untreated, alkyl- and amino-silanated cellulose (lyocell) fibers. The fiber-matrix acid-base interaction was quantified by (1) pairing the acidic parameter (KA) of one component with the basic parameter (KB) of another component and (2) observing the adsorption enthalpy of the polymer building blocks (ethylbenzene) onto the fibers. Results show that the cellulose/polystyrene acid-base interaction inferred from interaction parameters is closely correlated to that evaluated from the specific adsorption of ethylbenzene. This feature indicates that the acid-base interactions, which play an important role in the adhesion between fibers and polystyrene, can be conveniently predicted from their respective acid and base parameters (K A and KB) prior to composites' manufacture. A specific implication of this study is that treatment with an aminosilane is likely to improve interaction and, hence, bonding with polystyrene in a composite system. Treatment with alkylsilane, on the other hand, would result in a weak interaction with polystyrene. These predictions will be verified in future studies which will correlate materials interactions with interfacial micromechanics in the resulting micro-composites.

  • 12.
    Werner, Oskar
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology.
    Pettersson, Bert
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology.
    Wågberg, Lars
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology.
    Characterisation of Wetting by Solidification of Agarose Solution Sessile Drops2008In: Journal of Adhesion Science and Technology, ISSN 0169-4243, E-ISSN 1568-5616, Vol. 22, no 15, p. 1919-1929Article, review/survey (Refereed)
    Abstract [en]

    A new method for characterising the wetting of structured surfaces is presented. Sessile drops of a warm agarose solution were placed on test surfaces and then removed after the gelation of the agarose solution caused by the cooling of the drop. By studying the base of the sessile drops using confocal microscopy and image processing it was possible to determine the wetting mode and general appearance of the liquid-gas interface beneath the drop. The method also shows potential to measure the wetted area, and local contact angles beneath the footprint of a sessile drop. The applicability of the method was also demonstrated by its application to periodically structured photopolymer plates and surfaces covered by microsized glass spheres.

  • 13.
    Zhu, Hongli
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
    Li, Yuanyuan
    Pettersson, Bert
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology.
    Zhang, Liming
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Wood Chemistry and Pulp Technology.
    Lindström, Mikael
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Wood Chemistry and Pulp Technology.
    Henriksson, Gunnar
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Wood Chemistry and Pulp Technology.
    Technical soda lignin dissolved in urea as an environmental friendly binder in wood fiberboard2014In: Journal of Adhesion Science and Technology, ISSN 0169-4243, E-ISSN 1568-5616, Vol. 28, no 5, p. 490-498Article in journal (Refereed)
    Abstract [en]

    The application of lignin as binder in wood composite panel is not only environmentally friendly but also commercially attractive. The dissolving of technical soda lignin is the most premier challenge in its application. In this study, the effect of different key factors on soda lignin solubility in urea was investigated. The maximum solubility of 60.16g/L was obtained under the temperature 70 degrees C, urea concentration 8M, lignin content 7%, and pH 8.8. Then, different kinds of wood fiber material were mixed with the dissolved lignin solution to make fiber board separately. The results showed that the lignin can enhance the tensile strength of particleboard and can be used as a binder in wood material, but the strength will be different with different materials. The optimal tensile strength obtained was 44.63MPa with the sample made from oriented cotton linter sheet.

1 - 13 of 13
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