Evaluation of β-diketone-containing Polymeric Coupling Agents for Enhancing the Adhesion of Epoxy to Aluminum |
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| Authors: | Stephanie L. Nesbitt John A. Emerson James P. Bell |
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| Affiliation: | a Department of Chemical Engineering and Polymer Program, University of Connecticut, Storrs, CT, USAb Michelin Americas Research and Development Corporation, Greenville, SC, USAc Sandia National Laboratories, Albuquerque, NM, USA |
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| Abstract: | β-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 β-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 β-diketone-containing monomer with aluminum substrates, no reactivity of the β-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 β-diketone functionality. |
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| Keywords: | Polymeric coupling agents β-diketones adhesion aluminum epoxy |
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