Reversible swelling-shrinking behavior of hydrogen-bonded free-standing thin film stabilized by catechol reaction

Sun, J.; Su, Chao; Zhang, X.; Yin, W.; Xu, J.; Yang, S.

doi:10.1021/la5048479

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Authors

Sun, J.

Su, Chao

Zhang, X.

Yin, W.

Xu, J.

Yang, S.

Date

2015

Type

Journal Article

Metadata

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Citation

Sun, J. and Su, C. and Zhang, X. and Yin, W. and Xu, J. and Yang, S. 2015. Reversible swelling-shrinking behavior of hydrogen-bonded free-standing thin film stabilized by catechol reaction. Langmuir. 31 (18): pp. 5147-5154.

Source Title

Langmuir

DOI

10.1021/la5048479

ISSN

0743-7463

School

Department of Chemical Engineering

URI

http://hdl.handle.net/20.500.11937/56052

Collection

Curtin Research Publications

Abstract

© 2015 American Chemical Society. Dopamine-modified poly(acrylic acid) (PAA-dopa) and poly(vinylpyrrolidone) (PVPON) was layer-by-layer (LbL) assembled to prepare thin film based on hydrogen bonding. The carboxylic group of acrylic acid and the phenolic hydroxyl group of dopamine can both act as hydrogen bond donors. The critical assembly and the critical disintegration pH values of PVPON/PAA-dopa film are enhanced compared with PVPON/PAA film. The hydrogen-bonded PVPON/PAA-dopa thin film can be cross-linked via catechol chemistry of dopamine. After cross-linking, the film can be exfoliated from the substrate in alkaline solution to get a free-standing film. Moreover, by tuning the pH value, deprotonation and protonation of PAA will make the hydrogen bond in the film break and reconstruct, which induces that the free-standing film has a reversible swelling-shrinking behavior.