Hydrogen-Bonding-Directed Layer-by-Layer Assembly of Poly(4-vinylpyridine) and Poly(4-vinylphenol): Effect of Solvent Composition on Multilayer Buildup
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Abstract
This paper describes the buildup of hydrogen-bonding-directed poly(4-vinylpyridine)/poly(4-vinylphenol)
(PVPy/PVPh) multilayer film that was fabricated by layer-by-layer (LbL) assembly of
PVPy and PVPh from an ethanol solution. UV-visible spectroscopy and Fourier transform
infrared (FT-IR) spectroscopy revealed a uniform deposition process. The interaction
between PVPy and PVPh was identified as hydrogen bonding through FT-IR spectroscopy
and temperature-dependent IR spectral changes of the hydrogen-bonded multilayer. Notably,
we discussed the effect of solvent conditions on the growth of PVPy/PVPh multilayer
films monitored by UV-visible spectroscopy. It was found that increasing the ratio
of N,N-dimethylformamide (DMF) in the mixed ethanol/DMF solvents resulted in a marked
decrease of the amount of polymers adsorbed, which was attributed to the increased
polarity of the adsorption solutions. Furthermore, the solvent stability of PVPy/PVPh
multilayer film in mixed ethanol/DMF solvents with different DMF ratios was also investigated.
As a result, a new method for tuning the structure of hydrogen-bonding-directed multilayer
film was developed.