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Anisotropic expansion of PEDOT/PSS-PAM films in water

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Abstract

We have found for the first time that the PEDOT/PSS-PAM film expands in water when the film is consisted of water-soluble polyacrylamide (PAM). Furthermore, the expansion of the film is evidently anisotropic, i.e., the film area increases while the film thickness decreases. The expansion also has an induction period in the initial stage where the film thickness rapidly increases to attain maximum thickness, while the film area is kept in unchanged. The anisotropic expansion can be well-explained by our hydrophilic-lipophilic-competing (HLC) model proposed in terms of chemical potentials of PAM between the solid state and the solution, coupled with the character of water insoluble PEDOT segment. It is considerable that the larger the △μPAM was, the more the film expanded. The higher content of PAM in the film results in the larger μfPAM, then the larger △μPAM. The dilution of PAM in water also results in the lower μwPAM, then the larger △μPAM. Noting that the sign change of the fsur and fth where fsur and fth are forces biased on surface direction and thickness direction of the film, respectively, occurs at different immersing time, which is a main driving force of the anisotropic expansion of the film.

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Funding

This work was supported by the “Key Project Seeds” fund in College of Chemistry and Molecular Engineering, Zhengzhou University, and by the “2014 Creative Talents in Science and Technology” fund in Henan province, China.

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Authors and Affiliations

  1. College of Chemistry and Molecular Engineering, Zhengzhou University, 100 Kexue Road, Zhengzhou, 450001, China

    Hu Yan, Xiao-Qing Guo, Ying-Jun An & Wen-Ying Mao

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  1. Hu Yan
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  2. Xiao-Qing Guo
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Contributions

X.G., Y.A., and W.M. did the experiments. H.Y. wrote the manuscript and designed the project. All authors reviewed the manuscript.

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Correspondence to Hu Yan.

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Yan, H., Guo, XQ., An, YJ. et al. Anisotropic expansion of PEDOT/PSS-PAM films in water. Colloid Polym Sci 298, 653–660 (2020). https://doi.org/10.1007/s00396-020-04641-4

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