FTIR Study on interfacial interactions between hydrated aluminium and polar groups in ethylene copolymers

Abstract

By means of reflection-absorption infrared spectroscopy, interfacial interactions were studied between hydrated aluminium and two ethylene copolymers, poly(ethy1ene-co-butyl acrylate) (EBA) and poly(ethy1ene-m-acrylic acid) (EAA). The hydrated aluminium surfaces were obtained by immersion in boiling water, which produces a pseudoboehmite film consisting of aluminium oxyhydroxide. Thin films of the polymers were prepared on the substrates by solution casting. Owing to the relatively large surface area of the substrates after hydration, it was possible to obtain spectra only representing polymer interacting with the surface. For EBA, the carbonyl absorbance of the bulk at 1735 cm-' was displaced to 1698 cm-' at the interface, owing to an interaction with the hydroxy groups on the hydrated surface. For EAA, on the other hand, a carboxylate was observed at the interface with the hydrated surface. The carboxylate formation and the large displacement of the carbonyl in the case of EBA indicate that strong bonds are formed at the interface. This is also supported by the results of the adhesive strength for EBA, where the locus of failure was changed from adhesive to cohesive.

Interfacial interactions of plasma-polymerized acrylic acid and an oxidized aluminium surface investigated using XPS, FTIR and poly(acrylic acid) as a model compound

“…31, were not efficient in reducing the surface carbon concentration. Increased immersion times resulted in a visually mottled surface, which we interpret as Ñaking o † of the outer pseudo-boehmite Ðlm.…”

Highlighting Chemical Bonding between Nylon-6.6 and the Native Oxide from an Aluminum Sheet Assembled by Laser Welding

“…The possibility of using nondestructive techniques like sum frequency generation (SFG) has been attempted . The problem can also be scaled down by depositing a thin film of one of the studied materials on the other one, followed by surface analysis. , Another way to tackle the problem of accessing the interface, is the use of model samples. The principle consists in depositing a smaller molecule that contains the reactive part of the organic material.…”

Quantitative chemical composition of thin films with infrared spectroscopic ellipsometry: application to hydrated oxide films on aluminium

“…12 Direct measurements of thin films formed after hydration in boiling water have been done using infrared reflection absorption spectroscopy (IRRAS), 2 which has allowed the study of the interfacial interaction between ethylene copolymers and the hydrated layer. 13 A drawback of conventional IRRAS is that the correct determination of the position of the absorption lines is not straightforward.…”