Rhodamine loading and releasing behavior of hydrogen-bonded poly(vinylpyrrolidone)/poly(acrylic acid) film

The hydrogen-bonded poly(vinylpyrrolidone)/poly(acrylic acid) (PVPON/PAA) thin films were prepared by the step-wise interfacial complexation, i.e. layer-by-layer assembly process. Rhodamine B (RB), was utilized as mode compounds to investigate the pH and the temperature effect on the loading and releasing behavior of the hydrogen-bonded thin film. The releasing shows reverse trend compared with the loading. In the pH region from 0.7 to 4.5, as pH value increases the loading content becomes high while the releasing become slow. As temperature increased from 10 to 90, the RB loading slows down while the releasing accelerates.