Evaluation of β-diketone-containing Polymeric Coupling Agents for Enhancing the Adhesion of Epoxy to Aluminum

Abstract

@-diketone-containing polymeric coupling agents (PCA) were evaluated as potential adhesion enhancers for an epoxy/aluminum bond system. Torsional shear joint measurements revealed that the @-diketone-containing PCA did not influence the joint strength and durability, positively or negatively. as compared with untreated controls. Grazing angle infrared spectroscopy revealed that despite reactivity of the /Il-diketone-containing monomer with aluminum substrates, no reactivity of the @-diketone was observed once the monomer was incorporated into the polymer. Deposition studies showed that the resulting PCA coating thickness following treatment and solvent rinsing was not a function of solvent solubility parameter, solution concentration, or immersion time. It was hypothesized that preferential physisorption of the phenyl and/or epoxy functionalities in the PCA inhibited reactivity of the /3-diketone functionality.

Synthesis of highly magnetic iron nanoparticles suitable for field structuring using a β-diketone surfactant

“…With this in mind, we chose to work with a weak surfactant, a b-diketone. b-diketones do have a history as adhesion promoters in bonds between metals and polymers [13], but to our knowledge have never been used to synthesize metallic nanoparticles. We see the limited reactivity of b-diketones as an advantage: the b-diketone is much weaker oxidizer than carboxylic acids or alcohols and will not oxidize iron, it is not as nucleophilic as phosphines, yet it is known to be capable of chelating iron.…”