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Issue 8, 2006
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Water uptake behavior of hydrogen-bonded PVPON–PAA LBL film

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Hydrogen-bonded films of poly(vinylpyrrolidone) (PVPON) and poly(acrylic acid) (PAA) were built on a silicon and quartz surface using the layer-by-layer (LBL) assembly technique. Upon incubation, PVPON and PAA chains in the film can attain high-level miscibility and the film becomes homogeneous and transparent. TGA and elemental analysis indicate that the water content of the incubated PVPON–PAA film is only ∼4%. FT-IR proved that at high temperature these water molecules can be easily driven out of the film. When the incubated film was characterized with a spectrometer, it exhibited Fabry–Pérot fringes in the UV–visible–NIR spectrum. Such Fabry–Pérot fringes, sensitive to the change of water content in the film, were applied to study drying, drying–rewetting cycle, and humidity-responsive behavior of the film. The film exhibited reversible swelling–deswelling behavior during the incubation–heating cycles. The film thickness was found to decrease ∼10% upon drying. When the dry film was exposed to different humidity environments, it was found that the optical thickness of the film has a linear relationship with ambient humidity.

Graphical abstract: Water uptake behavior of hydrogen-bonded PVPON–PAA LBL film

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Publication details

The article was received on 17 May 2006, accepted on 14 Jun 2006 and first published on 29 Jun 2006

Article type: Paper
DOI: 10.1039/B606923A
Citation: Soft Matter, 2006,2, 699-704
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    Water uptake behavior of hydrogen-bonded PVPON–PAA LBL film

    S. Yang, Y. Zhang, Y. Guan, S. Tan, J. Xu, S. Cheng and X. Zhang, Soft Matter, 2006, 2, 699
    DOI: 10.1039/B606923A

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