Influence of the viscosity and the substrate on the surface hydrophobicity of polyurethane coatings

Meincken, Martina; Klash, Abdalah; Seboa, Sharrief; Sanderson, Ronald D.

doi:10.1016/j.apsusc.2006.01.014

Cited by 16 publications

(10 citation statements)

References 12 publications

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Section: Introductionmentioning

confidence: 99%

“…PFM has been used to characterize different kinds of systems, − e.g., adhesive properties of silicon surfaces chemically modified with silanes and blends of nylon-6 and ethylene- co -propylene- co -diene rubber (EPDM) . Meincken et al used a hydrophilic silicon tip to obtain adhesion maps on the surface of polysulfone membranes and polyurethane coatings with the aim of distinguishing hydrophilic from hydrophobic domains. Other authors applied the pulsed force mode to map adhesive forces on DNA molecules stretched out on a surface using alkane−thiol modified tips and evaluated the influence of the surface topography on the adhesion values measured.…”

Section: Introductionmentioning

confidence: 99%

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Surface Mechanical Properties of Thin Polymer Films Investigated by AFM in Pulsed Force Mode

2009

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Atomic force microscopy in the pulsed force mode (PFM) is applied in this work to the study of thin dewetting patterns formed by drying an aqueous solution of poly(N-isopropylacrylamide) (PNIPAM) and sodium dodecyl sulfate (SDS) on mica. This technique allows the automated acquisition of typically 4 x 10(6) force-distance curves on the sample surface together with maps showing nanodomains differentiated by their stiffness and adhesion to the tip. Topography images of dry films revealed a morphology formed by droplets distributed on the substrate. Adhesion and stiffness images with good lateral resolution show droplets containing polymer and surfactant contrasting with the substrate and also nanosized heterogeneities inside these droplets. They also revealed very small dewetted structures which could not be observed in the topography map by noncontact AFM. Adhesion interactions between the AFM tip and the polymer or the dewetted mica substrate were measured in terms of adhesion force and detachment energy, and can be used as new information to understand dewetting patterns containing silica particles, PNIPAM, and SDS. Other surface mechanical parameters such as stiffness, maximum indentation, hardness, compliance, hysteresis, and Young's modulus were obtained by sampling many points and used to characterize the PNIPAM/SDS films formed in the dewetting process.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Surface Mechanical Properties of Thin Polymer Films Investigated by AFM in Pulsed Force Mode

2009

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“…Higher viscosity indicated stronger interaction between molecules or residues. The contact angle of WPU0002-SPI was bigger than that for WPU0500-SPI ( Figure 3) because with higher viscosity, WPU0002-SPI formed more hydrophobic liquid drops 22,23 .…”

Section: Viscosity Analysismentioning

confidence: 92%

Soy-oil-based waterborne polyurethane improved wet strength of soy protein adhesives on wood

Liu

Sun

2017

International Journal of Adhesion and Adhesives

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Soy-oil-based waterborne polyurethane (WPU) is used to improve wet strength in shear test of wood bonded with an adhesive of soy protein isolate (SPI) by dispersing WPU into SPI slurry. WPU's effects on the physiochemical properties of WPU-SPI adhesives are characterized through Fourier transform infrared spectrum, transmission electron microscopy, thermal analysis, contact angle, and mechanical strength. Wet strength of the WPU-SPI adhesives increases by 65% compared to SPI control. Moreover, the microstructure of WPU has effects on the interactions between WPU and SPI. In this study, smaller and more uniform distributed WPU0002 is easier to interact and form stronger crosslinking network with protein than WPU0500. The stronger interaction between WPU0002 and protein results in increased viscosity and bond strength. The WPU-SPI blended adhesives show significantly improved wet strength, demonstrating their potential as wood adhesives.

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“…Modern techniques of microscopy, mainly scanning probe microscopy (SPM), are revealing interesting properties of solid surfaces, regarding the topography, and also electric, magnetic, hydrophilic, and other surface-related properties. − In the case of surfactants and other amphiphilic molecules, these studies are especially important because the self-organized structures formed by these molecules in liquid media are well-characterized, but little is known about their morphology after drying. Moeller et al used KFM to analyze assemblies of perfluoroalkyl alkanes spin-cast on mica, silicon, or graphite substrates.…”

Section: Introductionmentioning

confidence: 99%

Electrostatic Patterns on Surfactant Coatings Change with Ambient Humidity

2010

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Sodium dodecyl sulfate (SDS) deposited by dewetting on mica under well-defined experimental conditions presents patterns with characteristic morphology and electric potential distribution. These are formed by surfactant steps and terraces, with more negative potential on the steps than on the terrace surfaces. Kelvin force microscopy results show that the electric potential on the sample surfaces becomes more negative just by increasing the atmospheric relative humidity from 30 to 70%, within a grounded and shielded environment. The kinetic effect of the potential variation was also evaluated by keeping the sample at the same humidity for short (2 h) and longer times (24 h). In the last case, the electric potentials changed to more negative values, nonreversibly. Changes on the surface electric patterns are not paralleled by morphological changes in the lamellar structure, since no significant variations in the topography are observed. It is also interesting to note that, despite the persistent negative potential values acquired under high humidity conditions, the potential difference between each terrace surface and its neighboring step is constant and within a narrow range (60−100 mV), indicating that the negative charge is uniformly distributed throughout the crystal.

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Influence of the viscosity and the substrate on the surface hydrophobicity of polyurethane coatings

Cited by 16 publications

References 12 publications

Surface Mechanical Properties of Thin Polymer Films Investigated by AFM in Pulsed Force Mode

Surface Mechanical Properties of Thin Polymer Films Investigated by AFM in Pulsed Force Mode

Soy-oil-based waterborne polyurethane improved wet strength of soy protein adhesives on wood

Electrostatic Patterns on Surfactant Coatings Change with Ambient Humidity

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