Abstract
A facile way to prepare free-standing polyelectrolyte multilayer films of poly(sodium 4-styrenesulfonate)(PSS)/poly(diallyldimethylammonium)(PDDA) was developed by applying a new pH-dependent sacrificial system based on cross-linked poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA) microgels. The tertiary amine groups of PDMAEMA microgels can be protonated in acidic environment, and the protonated microgels were deposited by layer-by-layer (LbL) technique with PSS. PSS/PDDA multilayer films were constructed on the top of the PSS/microgels sacrificial layers. The LbL assembly process was investigated by UV–vis spectroscopy. Further study shows that the free-standing PSS/PDDA multilayer films can be obtained within 3 min by treating the as-prepared films in alkali aqueous solution with a pH of 12.0. The pH-triggered exfoliation of PSS/PDDA multilayer films provides a simple and facile way to prepare LbL assembled free-standing multilayer films.
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Acknowledgments
This work was financially supported by the National Basic Research Program of China (2013CB834502), the Germany-China Joint Project TRR61 (DFG-NSFC Transregio Project), and the National Natural Science Foundation of China (51303195, 21304105). We thank Mr. Jun Xu at Tsinghua University for his kind help with AFM imaging. We thank Prof. Xi Zhang of Tsinghua University for the useful discussions.
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Zhang, J., Yuan, B., Wang, Z. et al. Fabrication of free-standing multilayer films by using pH-responsive microgels as sacrificial layers. Colloid Polym Sci 292, 1235–1240 (2014). https://doi.org/10.1007/s00396-014-3188-x
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DOI: https://doi.org/10.1007/s00396-014-3188-x