Bonding of urethane reactants to aluminum surface

Kim, Jangsoon; Cho, Jaedong; Lim, Youn-Mook

doi:10.1007/s10853-005-2409-6

Cited by 18 publications

(10 citation statements)

References 6 publications

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“…Similar results have also been reported on aluminium surfaces; Kim et al [19] suggested that a strong interaction between isocyanate and aluminium hydroxide can be expected which was confirmed by Shimizu et al [20].…”

Section: Dft Calculationsupporting

confidence: 83%

The interfacial interaction between isocyanate and stainless steel

Tardio

Abel

Carr

et al. 2019

International Journal of Adhesion and Adhesives

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Section: Dft Calculationsupporting

confidence: 83%

The interfacial interaction between isocyanate and stainless steel

Tardio

Abel

Carr

et al. 2019

International Journal of Adhesion and Adhesives

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“…In a few publications, vibration spectroscopy and XPS have been used to characterize the adsorption states of selected PU monomers on metal surfaces [23][24][25][26][27][28][29]. Though spectroscopic information is never directly related to the binding state of molecules on solids, the proposed mechanisms are believed to describe chemical adhesion of polyurethanes on metal substrates.…”

Section: Introductionmentioning

confidence: 99%

Adhesive Interactions of Polyurethane Monomers with Native Metal Surfaces

Nies

Wehlack

Ehbing

et al. 2012

The Journal of Adhesion

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Understanding of fundamental adhesion is a key issue for bonding, polymer composites, and coatings. In this study, diluted solutions of polyurethane monomers (methylene diphenyl diisocyanate isomer mixture-MDI, polypropylene ether triol-PPET) are exposed to the native surfaces of Au, Al, and Cu. The adsorption state of the molecules (from multi-to sub-monolayers) is investigated in situ by infrared external reflection absorption spectroscopy (IR-ERAS). A sequence of solvent rinsing steps helps to distinguish physisorbed from chemisorbed molecules. PPET sticks very weakly to the metals. The spectra reveal a bulk-like state. MDI adsorbs weakly on Au but the spectra differ significantly from the bulk state. On Al and Cu, MDI establishes strong adhesion. Rich new spectral features indicate a probably chemical nature of adhesion, and a specific structure in the neighboring adsorbate layer. However, detailed final conclusions on the adhesion mechanisms must not be derived without appropriate quantum mechanical modeling.

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“…The high reactivity of isocyanate groups with active hydrogen is potentially the most important aspect of the interaction between isocyanates and metals. There are several assumptions in the mechanism of interaction between an isocyanate group and a metal surface 2–4. Dillingham et al have studied the interface interaction between isocyanate based polymer and steel using Fourier transform infrared reflection (FT‐IR) and the mechanism proposed is that the isocyanate functional groups can react with hydrated oxide on the metal surface to form carboxylate salts as shown below:2 where M is a metal.…”

Section: Introductionmentioning

confidence: 99%

“…Kim et al have studied an interface reaction between a phenyl isocyanate and an aluminum hydroxide surface using electrochemical tests and optical observation. They have deduced a reaction mechanism using molecular modeling 4. Both the electrochemical test and optical observation imply that the isocyanate functional group prefers to react with hydroxide aluminum.…”

Section: Introductionmentioning

confidence: 99%

The characterization of the interfacial interaction between polymeric methylene diphenyl diisocyanate and aluminum: a ToF‐SIMS and XPS study

Shimizu

Phanopoulos

Loenders

et al. 2010

Surface & Interface Analysis

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Time of flight secondary ion mass spectrometry (ToF-SIMS) and X-ray photoelectron spectroscopy (XPS) have been employed to study the interfacial interaction between polymeric methylene diphenyl diisocyanate (PMDI) and aluminium produced by the deposition of a thin PMDI layer on the aluminium, in order to improve adhesion and/or abhesion performance.When the PMDI concentration increases, the intensity ratio fragments indicative of the reaction product with water (m/z = 106 u: C 7 H 8 N + ) to that of isocyanate group (m/z = 132 u:C 8 H 6 NO + ) decreases. A very thin MDI layer on oxidised aluminium samples exhibits lower 106/132 ratio than degreased samples as a result of less hydroxide/hydroxyl spices on the surface. This suggests that water reactions occur both at the surface of PMDI and at the PMDI/aluminium interface. The variation of the PMDI chemistry has also been studied by exposing PMDI treated samples to the air for various periods of time (a few hours to 14 days), in order to assess the reaction of the PMDI surface and PMDI/aluminium interface. At the interface, the yield of reaction with water is limited because of the finite amount of hydroxyl groups on the aluminium surface, and the water reaction is completed in a short period of time.However, the PMDI surface continues to react with water from the atmospheric. This methodology was also used to establish the presence of specific interactions at the PMDI/aluminium interface, and a fragment indicative of covalent bond formation between PMDI and aluminium (AlCHNO 3 -) is observed at the interface.2

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Bonding of urethane reactants to aluminum surface

Cited by 18 publications

References 6 publications

The interfacial interaction between isocyanate and stainless steel

The interfacial interaction between isocyanate and stainless steel

Adhesive Interactions of Polyurethane Monomers with Native Metal Surfaces

The characterization of the interfacial interaction between polymeric methylene diphenyl diisocyanate and aluminum: a ToF‐SIMS and XPS study

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