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FTIR Study on interfacial interactions between hydrated aluminium and polar groups in ethylene copolymers
Author(s) -
Strålin A.,
Hjertberg T.
Publication year - 1993
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.740200503
Subject(s) - aluminium , carboxylate , copolymer , polymer , ethylene , polymer chemistry , wetting , ethylene glycol , materials science , acrylate , infrared spectroscopy , chemical engineering , adhesive , methacrylate , chemistry , composite material , organic chemistry , catalysis , layer (electronics) , engineering
By means of reflection‐absorption infrared spectroscopy, interfacial interactions were studied between hydrated aluminium and two ethylene copolymers, poly(ethylene‐c‐butyl acrylate) (EBA) and poly(ethylene‐c‐acrylic acid) (EAA). The hydrated aluminium surfaces were obtained by immersion in boiling water, which produces a pseudo‐boehmite film consisting of aluminium oxyhydroxide. This 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 −1 was displaced to 1698 cm −1 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.