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Characterization of the Adsorption of Poly(acrylamide), Poly(4-methoxystyrene), and Poly(acrylic acid) on Aluminum Oxide by Inelastic Electron Tunneling Spectroscopy

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Abstract:

The adsorptions of polystyrene, poly(methoxystyrene), poly(acrylamide), and poly(acrylic acid) on aluminum oxide are investigated with inelastic electron tunneling spectroscopy. Comparison with infrared data for thin polymer films of the polymer samples gives insight into the adsorbed polymer configuration. Data indicate that poly(styrene) is weakly physisorbed to aluminum oxide, while poly(methoxystyrene), poly(acrylamide), and poly(acrylic acid) react to form strong bonds with the oxide surface. On the basis of this data, adsorption mechanisms are suggested for each of the polymers. Poly(acrylamide) adsorbs via a protonation of the amine group by the surface hydroxyl groups. Poly(4-methoxystyrene) forms a phenolate ion and can react further with the aluminum surface centers. Poly(acrylic acid) adsorbs to the oxide surface in a manner analogous to that of small organic acids such as the carboxylate ion.

Keywords: Analysis for polymers; Analytical methods; Molecular structures; Surface analysis; Vibrational spectroscopy

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702874447725

Affiliations: 1: Center for Catalytic Science and Technology, Department of Chemistry, University of Delaware, Newark, Delaware 19716; current address: University of Southern Mississippi, Department of Polymer Science, Hattiesburg, MS 39406 2: Center for Catalytic Science and Technology, Department of Chemistry, University of Delaware, Newark, Delaware 19716; current address: E. I. du Pont de Nemours & Company, Polymer Products Department, E256, Wilmington, DE 19898 3: Center for Catalytic Science and Technology, Department of Chemistry, University of Delaware, Newark, Delaware 19716

Publication date: September 1, 1987

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