Adhesion of polyurethane to surface-modified steel

Gähde, J.; Friedrich, Jörg; Gehrke, R.; Loeschcke, I.; Sachse, Jörg

doi:10.1163/156856192x00403

Cited by 28 publications

(5 citation statements)

References 10 publications

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“…For example, the presence of these highly reactive species improves the pull-off strength of silicone rubber coating from steel (Latifi et al 2014). Adhesion between steel and polyurethane, containing isocyanate groups, or with poly(pyromelliticdianhydride-co-4,4 V-oxydianiline)amic acid based adhesive, is enhanced due to the formation of OH groups on the steel surface after PT (Gähde et al 1992;Tang et al 2006). Carboxylic acids (-COOH), formed on the steel surface promote strong chemical bonding to the epoxy film adhesive (Lee et al 2009;Williams et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Enhancement of strength of adhesive bond between wood and metal using atmospheric plasma treatment

et al. 2020

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Combinations of wood and metal are interesting hybrid composite materials, joining together the low density of wood with the stiffness and strength of metals. Different types of adhesives are used to connect wood and metal elements, but the compatibility between adhesives used and load-bearing materials must be sufficient, which often is challenging. In adhesive bonding technology, surface treatments are a crucial step in the process. In this study, an atmospheric plasma discharge was employed to enhance the adhesion strength of joints between common beech (Fagus sylvatica L.) wood, metals (steel and aluminum alloy), and four different types of adhesives. The optical properties of plasma discharges and its influence on treated substrates' surface morphology depended on the inherent properties of the treated materials. X-ray photoelectron spectroscopy revealed the surface oxidation of all the materials after plasma treatment. Consequently, the surface free energy of all materials increased as well. The positive effect of the plasma treatment on the tensile shear strength of single-lap joints shows a high potential of atmospheric plasma treatment technology for enhancement of adhesives strength of joints combining wooden elements, wood and steel, or wood and aluminum alloys. In addition to that, expensive epoxy and polyurethane adhesives could be replaced by more affordable polyvinyl acetate and melamine-ureaformaldehyde adhesives, and still perform at equal levels if the plasma was applied prior to bonding.

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Section: Introductionmentioning

confidence: 99%

Enhancement of strength of adhesive bond between wood and metal using atmospheric plasma treatment

et al. 2020

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“…The process results in a clean and fairly reactive surface. 34 A series of plasma conditions in which the energy and treatment time were varied was carried out to investigate if bonding of the electrosprayed material onto the substrate surface could be enhanced in this way but did not provide any distinct improvements.…”

Section: Resultsmentioning

confidence: 99%

Development of an electrospray approach to deposit complex molecules on plasma modified surfaces

Kitching

Lee

Elam

et al. 2003

Review of Scientific Instruments

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Two established techniques have been coupled to allow surfaces to be precision engineered. Electrospray ionization to bring large, complex, intact molecular ions into the gas phase has been interfaced with a radio frequency ͑rf͒ plasma reactor to treat surfaces making them receptive to the deposition of active biomolecules. The new instrument has been designed and used successfully to deposit a number of high molecular weight molecules including the polysaccharide, sodium hyaluronan ͑HA͒, that has an important role in a number of physiological functions. Substrate material is treated using a rf glow discharge plasma chamber, to clean and activate the surface in a controlled manner, then exposed to a beam of multiply charged ions in the gas phase that have been generated using electrospray techniques. The ions are deposited gently onto the substrate and become covalently bound. The molecular integrity and stability of HA surfaces prepared in this way was established using x-ray photoelectron spectroscopy, changes in the observed contact angle, time-of-flight secondary ion mass spectrometry, scanning electron microscopy, and a biological assay-platelet adhesion to the surface.

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“…In this context, differences in the chemistry of the surface, as a consequence of different treatments or cleaning processes, will influence the degree and modality of interaction of the adhesives with this metal 7,8 .…”

Section: Introductionmentioning

confidence: 99%

Comparative study of the native oxide on 316L stainless steel by XPS and ToF-SIMS

Tardio

Abel

Carr

et al. 2015

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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The very thin native oxide film on stainless steel, of the order of 2 nm, is known to be readily modified by immersion in aqueous media. In this paper, XPS and ToF-SIMS are employed to investigate the nature of the air-formed film and modification after water emmersion.The film is described in terms of oxide, hydroxide and water content. The preferential dissolution of iron is shown to occur on immersion. It is shown that a water absorbed layer and a hydroxide layer are present above the oxide-like passive film. The concentrations of water and hydroxide appear to be higher in the case of exposure to water. A secure method 2 for the peak fitting of Fe2p and Cr2p XPS spectra of such films on their metallic substrates is described. The importance of XPS survey spectra is underlined and the feasibility of C60 + SIMS depth profiling of a thin oxide layer is shown. I INTRODUCTIONAISI 316L is an austenitic stainless steel which is widely used in applications that require a degree of resistance to crevice and/or pitting corrosion. The L identifier of 316L indicates lower carbon content than the standard 316 grade, a characteristic which reduces the susceptibility to sensitization (grain boundary carbide precipitation) and for this reason it is widely used in heavy gauge welded components. The typical composition of 316L steel is given in Table I. The corrosion resistance of stainless steel is a result of the presence of a thin oxide layer on its surface. The passivation of stainless steel takes place in atmospheric conditions which yields a film that is self-healing on localised damage. The oxide, naturally formed in the atmosphere, is generally referred to as the native oxide and it is affected by environmental factors and, for this reason, different methods are often employed to modify the oxide layer to make it suitable for particular applications. For example modifications of the 316L steel surface, to facilitate the deposition of supports for catalysts, were made by ensuring large surface areas where nickel oxide is predominant 1 or by forming chromium oxide films by immersion in a chromium electrolyte 2 . Sometimes it is important to see how the surface is 3 modified during operating conditions in order to, understand fouling or corrosion mechanisms. For instance there are works reporting on the growth of the oxide on the 316L stainless steel in high-temperature water, mimicking the conditions of a pressured water reactor 3 , and on the effect of welding, which provokes discoloration in the heat-affected zone of the steel which ultimately leads to corrosion 4 . As austenitic steels are among the most employed metals in biomedical applications, many studies concern with the improvment of the material from a biocompatibility as well as a stability of the oxide point of view 5,6 .This steel is also widely used as a substrate for adhesion; it is one of the "technological surfaces" on which organic coatings are applied. In this context, differences in the chemistry of the surface, as a consequence of different treatmen...

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Adhesion of polyurethane to surface-modified steel

Cited by 28 publications

References 10 publications

Enhancement of strength of adhesive bond between wood and metal using atmospheric plasma treatment

Enhancement of strength of adhesive bond between wood and metal using atmospheric plasma treatment

Development of an electrospray approach to deposit complex molecules on plasma modified surfaces

Comparative study of the native oxide on 316L stainless steel by XPS and ToF-SIMS

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