Water uptake behavior of hydrogen-bonded PVPON-PAA LBL film

Soft Matter
Shuguang YangXiaoli Zhang

Abstract

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.

References

Nov 5, 1997·Science·V S LinM R Ghadiri
Mar 6, 2003·Nature Materials·Jeri'Ann HillerMichael F Rubner
May 7, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Adam J NolteRobert E Cohen
Dec 28, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Shuguang YangChengming Li

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Citations

Dec 22, 2006·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Shuguang YangXiaoli Zhang
Mar 20, 2007·Soft Matter·Shuguang YangJian Xu
Apr 23, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Jiaxing SunShuguang Yang
Jun 27, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Xingjie ZanJulie A Champion

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