Abstract
AbstractThe adsorption of poly(vinyl butyral) (PVB) at the γ‐Fe2O3–benzene interface and the air–water interface was investigated by means of the adsorbance on γ‐Fe2O3 and surface pressure (π)–area (A) curves. The adsorption isotherms of PVB on γ‐Fe2O3 from the various solvents are of the Langmuir type and can be explained by competitive adsorption between PVB and the solvents. From the π–A curves of monolayers and the adsorbance on γ‐Fe2O3, it was confirmed that the adsorbed PVB on γ‐Fe2O3 is in a train‐loop conformation with the hydroxyl groups and the butyral segments directed toward the solution phase. The packing density of γ‐Fe2O3, particles in the magnetic coatings preferentially depends on the conformation of polymers on the particle surface. The PVB–solvent system which gives the most compact train‐loop conformation gives the highest dispersion and packing of γ‐Fe2O3 in the magnetic coatings.
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